Why not buy a subscription to Spotify?

Can someone here advise me of sources where I can download whatever music I want for free? As I’m a melomaniac, Every time I have no opportunity to listen to music, I go cold turkey to some extent. Also, it would be awesome if you can offer any online converters. I haven’t found any fine one though spent rather much time on searching. For now, I‘m using convertr.org, but I want to find a better one. So, any suggestions are highly appreciated. Thanks

WAV,btw, has higher quality of sound than MP3

I know this has been brought up before, but it would be awesome if we could import songs to play along with in SD3. Can you please add this feature?