The spine color of the bound music scores represents the kind of the instrument:
| Purple - Piano Green - Violin Aqua - Woodwind Yellow - Brass White - Percussion Red - String Ensemble Beige - Orchestra Maroon - Vocal Music |
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The call number is indicated on top left corner of a score. It looks like this:
The first digit of the number represents the number of players in a musical work.
| G: Solo Instrumental Music | ||
| Piano | GP | |
| Flute | GWF | |
| Oboe | GWO | |
| Clarinet | GWC | |
| Bassoon | GWB | |
| Horn | GWH | |
| Trumpet | GWTP | |
| Trombone | GWTN | |
| Tuba | GWTB | |
| Percussion | GX | |
| Guitar and Harp | GG | |
| F: Chamber Music | ||
| Piano Ensemble | FP | |
| Piano and Strings | FPS | |
| Strings | FS | |
| Wind Ensemble | FW | |
| Woodwind Ensemble | FWW | |
| Brass Ensemble | FBW | |
| Percussion Ensemble | FX | |
| E: Orchestral Music | ||
| General Orchestral Music | EA | |
| Ballet Music | EB | |
| Concertos | EC | |
| Concertos - Piano | ECP | |
| Concertos - Woods | ECW | |
| Concertos - Woodwind | ECWW | |
| Concertos - Brass | ECWB | |
| Concertos - Percussion | ECX | |
| Concertos - Violin | ECV | |
| Concertos - Viola, Cello and Bass | ECS | |
| Opera - Complete | B |
| Opera - Excerpts | BE |
| Choral Music | C |
| Vocal Solo Music | D |
| Music Anthology | A |
| Band Music | H |
| Electronic, Mechanical music | J |
| Musical Shows | K |
| Soundtracks | L |
| Jazz | MJ |
| Folk and Ethnic Music (International) | Q |
| Christmas Music | RC |
| Varieties and Humor | S |
