That's a good question. I'm not surprised that your client really loves the good ol' "listicle" approach, a la Buzzfeed & the like. The listicle was ~the~ thing to do in 2015/2016, it seems! I almost think that "Violin Teachers, Tutors" seems _kind of, slightly _keyword stuffy. I'd encourage you to instead place one of those two words (teacher vs tutor) in the meta description to make the title tighter & cleaner if you go with your preferred title.
I say this because I try to remember to cater to my searcher/user first & foremost with compelling titles & descriptions, while still giving nods to Google with proper practices. However... When in doubt, consider A/B Testing with your different locations to see which performs best! Good luck!