A. Class Mu
Mu classification numbers for printed music are used for works by one composer. It is arranged alphabetically by composer, then by title and/or type of work:
| Sample call number | What the line means |
| Mu | The item is printed music |
| pts | It's a performing format |
| B393 (Beethoven) | Composer number |
| sop (sonatas, piano) | Title letters |
B. Class M
Library of Congress M classification numbers are used for collections of music by various composers [M1, M2, M5-] and for editions of a composer's complete works [M3]. Within these numbers, the music is arranged by the medium of performance: instrumental works, M5-M1450; vocal works, M1495-2199.
Thank you to Peter Munsted http://libguides.mit.edu/music-call-numbers
Library of Congress ML (music literature) and MT (music theory) classification numbers include most of Lewis Music Library's books about music. Other Library of Congress classification numbers are used for books about topics related to music (e.g., GR for folklore, TK for acoustics).
A. Classes ML and MT
Thank you to Peter Munsted http://libguides.mit.edu/music-call-numbers
CDs and DVDs are in the Archer Library's closed stacks; request them at the Help Desk. The call numbers for most music recordings are like the Mu classification system for printed music and begin with PhonCD, XLP, MUS or DVD.
Many recordings can also be found through our Naxos Music database.