As an active performer, I am always looking for new sheet music. Unfortunately, most of the best sheet music stores have all but disappeared. Most everything has gone online. And while some online music stores allow previews and detailed information on what you are buying, many do not. This leaves it a crap shoot on whether the music that comes in the mail is what you were actually looking for.
There is a great online resource that I use frequently: The Petrucci Library- http://imslp.org/
It is a wonderful collection of mostly older music, categorized several different ways: by composer, instrument, genre, etc. Best of all, the music is free and can be downloaded and printed instantly. All of the music is public domain, so you won’t find much written in the past 75 years on there. However, if you’re in a pinch and need to find a piece quickly for a wedding or other performance, you may find it here.
Here is a direct link to the trumpet music section: trumpet
Bookmark this page and use it often!