I got a little distracted in viewing your animation (but hopefully that's a good thing!)
A few important things from my perspective:
1. You are animating to beats and that is going to make you a better animator
2. The attempt to analyze your animation has made me a better animator
3. Your concept is a great one and well worth exploring and perfecting.
A few things I recall off of the top of my head:
- There needs to be some music (the beating) before and after the guy begins to play his harmonica
- Because the end occurs after the guy has stopped playing the harmonica it might be ideal to play three beats that fade out (as if the band might be wondering if they should keep playing)
- There doesn't seem to be any particular reason for the guy to lift his foot higher and then step down on the bucket so I assume there may be something else going on here. Perhaps he slips and then knocks over the bucket but his action going into that does not convey that he has slipped in that way. (Here I will simply stress the importance of the contact frame especially given that this is the contact that triggers the major action in the scene)
- Adding a hint of a background will help to convey that the mop is not defying gravity (I assume it is leaning against the wall, lockers or some other thing but it's not good to have the audience assume anything unless you have first directed them to it. Unless of course, "What just happened?" is what you are really going for in the scene.
- The bucket and mop could use a little more shaping/detail to convey their identity at an immediate glance. At first I wasn't entirely sure it was a bucket and mop the guy was interacting with. All I percieved was that these two shapes were the objects that the guy was tripping on. As the symbols for 'mop' and 'bucket' are pretty universal, refining those just a little will quickly convey their primary function within the scene.
Summary: I don't know what all you did to plan this sequence but whatever it was is working! You have got some great action and activity going and with a little focused refinement it'll be a performance to remember.
Additional Analysis Tools: xsheet (basic)