I really like the balance and look of #64, but there are still a few things that I just don't know how to adjust, so I'll tell you what I'm seeing, and see what you come up with:
1. The music stand. I like the concept, and definitely think a pictoral element of some kind helps create balance in this design. However, the stand is very non-specific. Also, a lot of people I've shown this to have initially thought it said Torchestra. I liked the idea of going with an instrument, but I felt like we never went abstract enough with the concept to make it work. I really like the simple, rough-sketch style of the stand, and think maybe a similarly styled "impression" of an instrument might work. I'm not sure.
2. The "M." When we were looking at the instrument version, one change was that the "M" got bigger. I don't think it needs to be that big, but perhaps there is something in-between that might help balance a more vertical pictoral element like an instrument.
3. Whatever logo we go with will have to translate into black-and-white. Once we come up with any possible refinements, I am still concerned that the "M" will get lost in the pictoral element once the logo is taken to black-and-white. We can look at revisions addressing concerns 1 and 2, and then deal with 3.
I look forward to seeing what you come up with!