Oh that’s great. I do worry that even if you or the band do mention you’d rather sing lead, he would assume he would be on backup vocals. It’s a tough one. Instead of saying you’re bad at singing though, I would frame it in terms of what would be best for the band’s success.

If there’s one thing I’ve learned from the movies, ya gotta put it to a band vote. In rehearsal, you could also ask to sing some and see how the rest of the group reacts. Does he play anything else? If not, that’s definitely a bummer but you should always shout his song writing credits out when you can if you end up taking over as lead.