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Nah, Blue Danube was the song Homer Simpsons ate potato chips to in space. This is Waltz of the Flowers by Tachovsky, It's Always Sunny has used the song in a few episodes I think.

The song from the first section was Chopin . Was hoping to be all Chopin but could find good enough CC0/public domain versions of the Chopin songs wanted to use. So thinking of Satie or something else, nothing too disctinctive cause might be too distracting. I hope something familiar but not too familiar subject to what is available for free and properly licensed. If you want the url of where to get these I got from musescore I think, can find the url if you want.

starts about 1:12:00 or so