Entry #15 is definately an improvement. However, the 'Music' part of the Logo is too hard to see. I definately think that 'Harmonics' needs to be the larger word. Can you correct this?
I'd like to see you do something more eyecatching though. A really recognizable logo. Try some different fonts. Did you see the Lambretta font I posted as a PDF? This, or something similar might give you some inspiration. You could put lines in the logo too...? That way we're not overcompicating the logo with pictures and imagery, but there's more to it than just words.
In entry #16 the music part is definately clearer, but I think the Harmonics part is now too hard to read. It is also beginning to resemble the logo for the London Underground (Subway system)!