http://www.bandmusicpdf.org/library-bro ... ay=columns" target="_blank
This is an excellent free service of the N. Royalton [Ohio] Community Band Digital Library.Go to the site to read about it, rather than me trying to explain it. the only limitation is that it is restricted to those works that are older than current US copyright protection, so do not expect adaptations of Michael Jackson's greatest hits from this site. What is available are hundreds of wonderful standards of band literature, some terrific, some not so good. I find that browsing is a good option, and arranging the columns by clicking the various headers at the top, but you have the option of searching for a specific work, too.
Enjoy!
ScottW
