I ended up having to look it up to see how it'd be handled and, wow, there's a lot of shamisen/piano teamups. It's not likely to be something Blue Rose has done, given that she's not terribly familiar with Japan and Japanese culture (that's all Ivan and Kotetsu), but she should be able to adapt easily enough.

And she'll cheerfully help him out! She's been involved with The Industry for about four years now, so helping someone else from making mistakes would be something she's good for. She's competitive, but not to the point of sabotaging someone's career.