my take on looping is that if you have a vision in mind for a rapper and the loop works perfectly, and you as producer oversee it from start to finish and it comes out hot, then that does take talent because it was your idea to put that loop with those vocals, etc., and you should get credit for the finished product. but if u just loop a song and never add the vocals and just leave it for another producer and rapper to put together with vocals, how much credit should you really get?