TOPIC: Focus activities for Blues Class, new riffs added

Practice riffs to date are riffs 1, 13, 14, 15, 16, 23 and 26,
Additional new riffs added: are Riffs 7 and 20.

Also focus on 12 bar blues 'turn-around'
and don't forget:
Two string Shuffle #1 and four string Shuffle #2.