I strongly recommend Pro Gig Academy (Plus). I used to play my guitar and attempt to sing like the original artists, which was rarely successful. Finbar has shown us how to adjust the keys and chord shapes to get songs in the right vocal range in order to, ostensibly, be able to sing for a 3-hour gig. Just as importantly he has shown us how develop set lists that crowds enjoy. The entire community is supportive, creative, and on the road to getting gigs.