Song file size

I made my first song. It’s pretty simple with an intro, outro, two sections, fills, and transitions. The main sections are 4 bars, the fills and transitions are each 1 bar. It’s a little over 1MB though - which seems to be a bit larger than others I’ve downloaded from here. It was actually too big to upload to the forum. Any ideas why it’s so big? (It loads and plays fine…)

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