hey im doing a cover with my band of korn's blind. the vocalist recorded by listening to the mp3 and i adding the drums through a midi file. so the problem is that i think there are some tempo changes between the song. because my drums sound even in the begin but loose their timing during the verses.
Hm not the best idea it might be better to re-record to your drums. I don't think the drummer is playing to a click or consistent. Tempo seems to vary from 95-90..small subtle changes. I suspect it to be pretty tough to get accurate to the original track

I'd say your best bet to get it is using 7th string"Transcribe!", import the song from mp3 and tap in all measures/beats of the song, mark them by sections then calculate tempo for each section.