90GB, at 5-6MB per song... I’m not sure I’ve heard 15,000 different songs in my lifetime. Impressive, sir.
According to my music player on my desktop, it is 17809 tunes, that span 47 days 23 hours, and 39 minutes of playing time.
It's a lot like listening to a radio station that will play anything. Sometimes it's almost jarring to hear The Sons of the Pioneers followed by Rage Against the Machine, but I love music. I think just about any style of music has both good and bad points. I used to be mostly a 'classic rock' fan, but my dear wife, God rest her soul, opened me up to things I'd never really considered, just by asking me to listen closely for something to like. As time has gone on, I've found some merit everywhere. One of the most annoying things to me is when I find a group that I'd not heard of before, and take a serious shine to an album of theirs, only to find that they disbanded after one or two albums.
Here's a good example of something that you probably won't hear on any radio station: Smoothie Song by Nickel Creek (I strongly recommend any and all Nickel Creek albums). The fellow playing the mandolin is so talented, it puts the word 'virtuoso' to shame, yet he's primarily a bluegrass musician. If you have some time to burn, listen to Chris Thile playing with Yo-Yo Ma, Edgar Meyer, and Stuart Duncan here. You may not be familiar with these fellows, but they are all, with the exception of Thile serious classical musicians. I think Yo-Yo Ma has had a command performance before the queen. Yet, they are making music that is a fusion between bluegrass, classical and jazz that is mind blowing.
There is lots of good stuff going on in the world of music today. Don't let anyone tell you otherwise.