To source music I used WinMX, Limewire, Frostwire and currently Fopnu (made by the guy who originally developed WinMX and Tixati). I use torrents for albums, however I always support less successful/small time artists and buy their music.
I use YT for music occasionally, but it really pisses me off when a song suddenly becomes unavailable, usually due to some copyright bullshit. If you’re running android, check out Newpipe, it’s a 3rd party YT app that has no ads and supports downloading videos; the only caveat is that you can’t sign in with your account, so you have to manually re create all your playlists.
@𝐒𝐞𝐚𝐫
Damn, hope he had a backup of all those songs.