NearTao wrote:If it sounds good it is good... but since good is subjective... what you think sounds good may not sound all that hot to others...
Ultimately if you want to use .mp3 files, or sample off of them... it's fine... but the problem with starting there is that once the "information" is lost, you can never recreate it. So... the thinking of starting with better source material is that you have more "information" to work with, and can do things like time stretching, warping, filtering... and can work your way through what you want to turn the content into. This is not always an option for working with lossy or otherwise lower quality sound sources.
Again though... if it sounds good, it is good...
Other options when working with the best quality I can get, is that I can always go back to the source. When I sample a horn, I want that sample to be as close to that actually horn as I can. Mr Davis or Mr Coltrane, didn't sample their horn to get those tones.
Sample from a MP3 that's off of YouTube or Spotify is like 8+ generations from the masters recordings. That's why we look for original pressings that are about least 3 generations from masters. But like I said before, I'll sample it all, dirty, clean, masters, direct. But when the vaults are opened to the original multi-tracks or actual instruments that's what I'm chopping.