I need some advice: I have trouble playing with other guitarists, it's hard for me to learn a riff by watching it done, can anyone give me some advice on how to work with another guitarist and come up with a matching riff?
watch their fingers, try to see what key theyre in, try to see if you recognize a certain pattern theyre using(i.e. I IV V). stuff like that
If they are playing chords, learn what chords are in the progression and then you play the same chords, but as inversions. It can add a great dimension to the sound if it is done well.