Some music scores circulate and some don't.  The status of these is determined by the staff in the Music Library.  Below are links to records in the MOBIUS union catalog as examples of what you might be able to request, and those that do not circulate.  For those scores that do not circulate, you would be able to consult them on site in the Music Library.  For any questions regarding scores, feel free to contact the staff in the Music Library.

Examples of scores that one cannot request through MOBIUS:

http://searchmobius.org/record=b18477494~S0

http://searchmobius.org/record=b16509835~S0

Examples of scores that one could request through MOBIUS:

http://searchmobius.org/record=b26297257~S0

http://searchmobius.org/record=b19203512~S0