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In looping your piano track, does the last note die out to zero before the track starts again? That's the problem with a continuous form like the bubble sound. The beginning and end have to be perfectly matched at the same place in the waveform so that you don't hear a click or a silent moment.
MP3 is a compressed format, so that the end of the piece is "antialised" against the silence to follow. Those bytes would almost certianly not line up with the beginning if it started playing again instantly. Also, there is some decompression overhead that causes a slight delay at the beginning of an MP3 piece.
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