If you're a guitar player, and I'm guessing you are since you're here, here's a site that you must that a look at. It's Musicnotes.com, and it's a fantastic place to get sheet music, but it's much more than that.
I'm probably a little older than many of you reading this, and in my early days when you (I) wanted to learn a solo to a song, it was a matter of getting the LP (remember those ?), setting the turntable on (161/2) rpm