Beat #1: That's a tough song to chop up. I like the beginning of the bass but then it kind of gets a bit lost with the melody. But I think a harder drum track would fit really well over the chops you have.
Beat #2: Nice clean drums. Good mix. Good drum sequence. The piano sounds good but could use some variation. The piano change up you have is good though, I'd like to hear more of that.
Beat #3: Drums sound good. The keys are good but I think they would be better in stereo. Synth horns are hard to make sound realistic, I wouldn't use the one you have. Bassline is nice and subtle in the mix.