Guitar has so many notes ,so many styles and yes so many chords so how do a guitarist decides what to do and what not to do during improvisation and spontaneous jam sessions, in this abstract we will discuss how to improvise subtly.
So lets take an analogy, me and my band mates are chilling and suddenly our bassist shows up with a crazy bass riff , the riff is on a key of E, and he kept the time signature to be 4/4 just for the sake of simplicity . So moving on , the situation is tense, the bassist is on fire playing that cool groovy riff , then i kick in with my electric guitar and start playing licks in the key of E, now as we both are playing the same key and have same adjusted volume plus we both have the same tempo , so it starts getting damn groovy and tight, as me and the bassist have locked down the bars , the drummer kicks in with a cool 4/4 beat and here we all go improvising on real time basis and dropping down a crazy jam session.
In the above mentioned analogy it is quite evident that harmony , melody , rhythm and tonality plays the most important role in any jam sessions.
4 jazz musician meet up, this is how they laid down the structure of the jam session, always remember these are one of the most important meta data that is required to start a improvise session.
Musician 1 : key is e minor, instrument is electric guitar , tempo is 130 bpm
Musician 2 : key is e minor , instrument is double bass , tempo is 130 bpm
Musician 3 : snare and toms are tuned around e , instrument is jazz drum set, tempo is 130 bpm.
Musician 4 : key is e minor, instrument is piano, tempo is 130.
All the instruments in the following arrangement must have same tuning that is E in this cases, if not the jamming session will sound totally off tune.