MLA recommendation: Follow , observing the following approaches.

Books or scores issued with audio/video carriers: Follow method 1a or 1b.

Audio/video carriers with accompanying volume (insert, booklet, etc.): Generally follow method 3, that is, consider a booklet inserted in an audio/video carrier to be of “little bibliographic importance.” Optionally, if the accompanying volume is substantial in content and/or extent, follow method 1a or 1b.

MLA recommendation: Follow . Record media type associated with the primary content of a resource in all cases.

If feasible, record media type associated with any accompanying material that is described in 300 $e or in a separate 300, as follows. Record multiple instances of media type in separate 337 fields.

Books or scores issued with audio/video carriers: Encode in 337 and 007/00.

Audio/video carriers with accompanying volume (insert, booklet, etc.): Encode in 337.

If deemed useful for identification or selection, specify the carrier to which the term refers in 337 $3.

MLA recommendation: For resources of notated music consisting of a folded sheet or two or more nested folded sheets, with or without a single leaf in the middle, record the carrier term "volume" if the resource is intended to be used as a cohesive whole. For single leaves that contain parts or are otherwise usable separately, record the carrier term "sheet."  

If feasible, record carrier type associated with any accompanying material that is described in 300 $e or in a separate 300, as follows. Record multiple instances of carrier type in separate 338 fields.

Books or scores issued with audio/video carriers: Encode in 338 and 007/01.

Audio/video carriers with accompanying volume (insert, booklet, etc.): Encode in 338.

If deemed useful for identification or selection, specify the carrier to which the term refers in 338 $3.

See here for guidance on recording extent terms, carrier types and other elements for specific types of audio recordings.

MLA recommendation: Generally do not apply the alternative in a shared cataloging environment, that is, do not use a carrier term in common usage (e.g., "1 CD", "1 DVD-ROM").

MLA recommendation: Follow for the optional omission.

MLA recommendation: Routinely specify number of subunits for notated music content and audio files.

MLA recommendation: Routinely specify number of subunits for notated music content.

MLA recommendation: Routinely specify number of subunits for notated music content and audio files.

For resources consisting of more than one type of unit, separate each type by space-“+”-space. Alternatively, encode extent for scores and parts in separate 300 fields.

Note that the RDA definition of “score” includes music for a solo performer. (In AACR2, music for a solo performer was described as “p. of music”, “leaves of music” or “v. of music”.)

MLA recommendation: Follow . Use the appropriate extent term for notated music instead of “volume”.

MLA recommendation: Follow . Use the appropriate extent term for notated music instead of “volume.”

MLA recommendation: Do not apply this instruction to notated music. Instead, describe notated music on a numbered single sheet as “1 leaf” if only one side is numbered or as “2 pages” if both sides are numbered. If the sheet is unnumbered, describe it as “1 unnumbered leaf” if there is printing on one side or as “2 unnumbered pages” if there is printing on both sides. However, note that the carrier type (see 3.3) for a single sheet of notated music is still “sheet”.

MLA recommendation: Follow for the optional omission.

MLA recommendation: Follow for the optional addition.

MLA recommendation: Do not apply this instruction to notated music. Instead, describe notated music on multiple unbound sheets by combining an extent term with the number of leaves or pages, as appropriate. However, note that the carrier type (see 3.3) for multiple sheets of notated music is still “sheet”.

MLA recommendation: Follow , that is, record dimensions in all cases.

See here for guidance on recording dimensions and other elements for specific types of audio recordings.

MLA recommendation: Follow for the alternative.

Apply the exception for notated music by encoding dimensions of each carrier after the extent of that carrier, either in separate occurrences of 300 $c and $a, respectively, or in separate 300 fields. 

If giving separate 300 fields, give dimensions of each unit in $c, even if they are the same.

MLA recommendation: If feasible, record base material for certain types of audio carriers.

See here for guidance on recording base material and other elements for specific types of audio recordings.

MLA recommendation: If feasible, record applied material for certain types of audio carriers.

See here for guidance on recording applied material and other elements for specific types of audio recordings.

MLA recommendation: If feasible, record production method for manuscripts of notated music.

MLA recommendation: If feasible, record the production method for certain types of optical discs (e.g., CD-R, DVD-R, etc.). The production method is encoded in MARC 340 $d. Further explanation may be made in a note (RDA 3.9.1.4 Details of Production Method).

MLA recommendation: If feasible, record generation of audio recording for certain types of audio carriers.

See here for guidance on recording generation of audio recording and other elements for specific types of audio recordings.

MLA recommendation: If feasible, record type of recording for all audio carriers.

See here for guidance on recording type of recording and other elements for specific types of audio recordings.

MLA recommendation: If feasible, record recording medium for certain types of audio carriers.

See here for guidance on recording recording medium and other elements for specific types of audio recordings.

MLA recommendation: If feasible, record playing speed for certain types of audio carriers.

See here for guidance on recording playing speed and other elements for specific types of audio recordings.

MLA recommendation: If feasible, record groove characteristic for certain types of audio carriers.

See here for guidance on recording groove characteristic and other elements for specific types of audio recordings.

MLA recommendation: If feasible, record track configuration for sound-track films.

See here for guidance on recording track configuration and other elements for specific types of audio recordings.

MLA recommendation: If feasible, record tape configuration for certain types of audio carriers.

See here for guidance on recording tape configuration and other elements for specific types of audio recordings.

MLA recommendation: If feasible, record configuration of playback channels for all audio carriers

See here for guidance on recording configuration of playback channels and other elements for specific types of audio recordings.

MLA recommendation: If feasible, record special playback characteristic for all audio carriers.

See here for guidance on recording special playback characteristic and other elements for specific types of audio recordings.

MLA recommendation: Routinely record file type for digital audio carriers.

See here for guidance on recording file type and other elements for specific types of audio recordings.

MLA recommendation: Routinely record encoding format for digital audio and video carriers. If feasible, record encoding format for audio, video, and computer carriers treated as accompanying material.

A list of encoding formats is no longer part of the RDA vocabulary; when recording encoding format, do not use MARC 347 $2 rda. Use separate MARC 347 fields when recording both RDA and non-RDA vocabulary terms.

See here for guidance on recording encoding format and other elements for specific types of audio recordings.

MLA recommendation: Apply this instruction to non-standard audio carriers, encoding formats, etc., if deemed useful for identification or selection.