A few years ago I found myself without a band. I started taking lessons. I wanted to understand what some of the other 'proper' musicians I had played with were talking about. I didn't want to learn what I already knew so my tutor taught me quite a bit of Duke Ellington/Sinatra type stuff, underpinned with Simandl and Bach cello pieces. I loved it and think it opened up my thinking and playing. Unfortunately, if I now look at a score I haven't a clue how to play it, but I guess I could pick it up again.