I like the changes you have made, I think my main concern is with the colors that you are using. The blue/teal color does not work for me on 71, 72, and 74, but I like the design of these logos.
I really like the simplicity of 73, but the symbol with the guitar on the left doesn't look professional enough for our purposes. If there is anyway to change the 2 boxes with the guitar on the left to something more upscale with some depth, that would be very helpful.
I think the overall color scheme should focus more on brown, green and earthy organic colors. I'm not necessarily looking for something that blows me away artistically, just something that looks clean, creative, and stands out.
I look forward to your new changes.