Watch the Building the Rhythm Track online guitar lesson by Fareed Haque from Modal Improv Survival Guide
So after finding a nice guitar groove and some cool voicings, we lock it into a nice drum loop and voila! Jam Track! Notice how the two guitar parts both have interlocking melodies, and basslines. And all the parts lock nicely with the drums. Always try to find parts that 'hook up' with each other.