Finding scores and recordings can be complicated, but with a few quick pointers you can be assured that you're finding everything Tripod has to offer.  Searching is an art, not a science, and you'll need to play around with the catalog to see what works best for you.  Try some of the following techniques on a score or recording you're looking for and compare the search results.

1. Use the limit "sound recordings" or "music scores" from the drop down menu.
2. For non-unique title names, like Fifth Symphony or Third Piano Concerto, try doing an author search and then browsing to the relevant genre:

A keyword search will work, but because titles on cd cases and scores vary, you may not get a full set of results.  For example, searching for "firebird" as a keyword in music scores will get you nine results, but if you search for the uniform title (the Russian title) Zhar-ptitsa, you'll get 12 results.  Of course, you're probably not going to remember Zhar-ptitsa which is why using the author search and browse method works so well.  
3. Try more complicated keyword searches using AND or OR to combine terms.  For example, compare the results between "beethoven AND symphony AND five" and "beethoven AND symphon? AND (five OR fifth OR no. 5)."  The question mark is a wildcard character and will search for symphony or symphonies or symphonie in the catalog.  Using the parentheses and the OR will widen your search, helping you find every recording we've got of the symphony (notice, however, that your search results will not be as accurate as with an author or title search).