“A jam session is a musical event, process, or activity where musicians play (i.e. jam")
by improvising without extensive preparation or predefined arrangements.”
Wikipedia

Jamming is great; it breaks the boundaries of set music and allows you to be creative with other musicians. But not everybody has joined a jam session before. So here are a few basic tips to get you jamming straight away:

• First of all: Don’t be afraid to make mistakes! Enjoy the music and learn from it – there’s no judgement here 
• Start simple! Agree on a chord progression, two chords are enough at ...