I like the show time singer profession but sing-a-gram requests are quite annoying

I agree, sing-a-grams are totally annoying, and I would love to have a mod that would put a stop to them. It's a hassle just to catch up with the recipient, as unlike opportunities, they don't stop where they are and wait for your sim to reach them. I just ignore the requests once my sims get regular gigs at the performance venues. In fact, I ignore most of them even before that, and mostly just have them sing for tips instead.