I picked 55000 to 59999 songs, but it's kind of a guess.
There's about 35.000 songs on my PC, I have about 1200 records and 350-400 CD's, but I can't really tell how much music I've got, since I've got a lot of tapes (reels) and cassettes which have varying amounts of tracks on them.
I think I can safely say that I have at least 40.000 different tracks in my home