Double tracking is a technique whereby one would record the exact same part twice. Double-tracking does not refer to recording an alternate line or a harmony part; it is the same part recorded for the second time. Why would you do that? A double-tracked part can give incredible thickness and richness to a part. It works particularly well with distorted electric riffs. Believe me, I’ve experimented with double-tracking everything; some things work better than others! The aim is for the average listener not to notice that there are two recordings of the same part. The doubled part needs to be…