"When did guide tracks live become acceptable in hip hop?"
Eminem a few years ago was the first I noticed using it, but now seems pretty common. With ppl claiming Jeezy is killin' it at Summer Jam tonight by rapping 40% of each line while the dj plays the actual record. Maybe some ppl it's about seeing the rapper live or just sharing the music with a whole bunch of ppl but I think it's wack as hell.