Sometimes, it is nice to just browse through the music available in the library for a specific instrument. Unfortunately, doing so is not very intuitive.
Over time, you will likely learn where music for your own instrument is shelved just through experience, but in general the arrangement is as follows:
Did you know that there are two different interfaces to search the UMD catalog?
There is this Worldcat interface that you are probably familiar with:
And there is the "Classic Catalog" interface:
In order to search by call number and browse items that are on the shelf electronically you will need to use the Classic Catalog.
By using the Classic Catalog you can immediately narrow your search to call numbers:
Here is what the search results look like when searching the call number range M237-238: