2) Audiogalaxy You might find my choice of web music tool a bit weird. After all, I won't shut up about Spotify. I could have chosen Napster too, which introduced me (and the world) to file-sharing. But no, Audiogalaxy wins out for one reason. "Related artists". Those two simple words made me spend more money on music than I ever would have otherwise. Audiogalaxy was the first P2P client I used that recommended music based on what other stuff you downloaded. It turned me from a casual music fan into the massive music geek I am today, and it's directly responsible for the masses of physical, paid-for albums that litter my flat. The day it was shut down, I nearly cried.