I finished. (Thanks to RedUchiha for the level 19 hint.) 25 is last level. I was able to get it to bounce back and forth right in the middle, took a good minute and a half of waiting and no-touching.
I have to say I liked the previous two, but this one is way too touchy - almost impossible to get some of these. Hard to see where the end of the instrument is that you're working with. Graphics are amazing though.
Easier than your first iteration (Sunnyland), but in a good way. The timer actually works on the swinging thing (that robot in sunnyland was an s.o.b.).
I'm with workingrobbie. 123Bee, I really want to like your games. You put a lot of work into the graphics and the puzzles, but there's no logic to it. It's really a clickfest.
Walkthrough is dispersed in the comments here: http://www.escapegames24.com/2008/10/alphabet-escape.html