Lyric discussion by Spruce 

The Longiness Symphonette was a popular musical act/performance from the '50s or '60s. An orchestra would play short versions of well-known classical music pieces, launching from one piece to another without stopping. You'd hear 2-3 minutes of Bach, then some Tchaichowsky, then a little bit of Mozart, one after the other. That's where the lyric "...it doesn't rest," comes from. It wasn't a full-fledged symphony, but an easy-on-the-ears "symphonette." You can guess that the serious critics hated it, since it was basically the K-Tel of its day, but it was a big hit with Joe Average. Clever stuff.

@Spruce "Launching from one piece to another without stopping" sounds like "Fingertips."

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