One of the most enjoyable parts of learning an instrument is jamming along with friends in a basement or a garage. This practice has birthed some of the greatest rock bands of our time.

Nirvana, for instance, was merely a garage band when they were signed to their first label, later becoming one of the biggest rock bands in the world.

These jams are usually spontaneous, revving on a round of a few chords, bouncing between band members for solos, and coming up with cool new musical ideas.

Jamming isn’t always so informal, though. If you want to be a go-to session cat, your improvisation will have to be top notch.

This level of improvisation takes a lot of practice, as these musicians are expected to improvise new, exciting, and tasteful guitar parts for the songs they work on day in and day out.

Studio guitarists often write their parts in a matter of hours. The best of the best may have the perfect guitar part on the first take, without hearing the song beforehand.

How do they...