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MMA:
Group #2

Each song was a "bonus" track on a Greatest Hits album.


Correct.

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Dash:

SIX - They were all covers? I'm just guessing

SEVEN - GThey all debuted at #1 on the Hot 100.

EIGHT - All the song names have () in them


Wrong on six. Correct on seven and eight (yes, I did make EIGHT that simple).

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SoFre:
NINE:

I am only familiar w/ "Dear Jessie" and "I Say a Little Prayer," but I'll guess that the rest also have a time signature change. 4/4 to 3/4 and back to 4/4, no?


Incorrect. Not all of those songs have a time signature change, but I'll salute you (since I don't swoon) for recognizing a time signature in ISALP - especially the fact that it goes from 4/4 to 3/4 and back. For this installment, I avoided music theory for links.

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Misplaced:
Group 5 - The ladies do vocals for songs by another artist? I only know the Janet and Toni songs, and that applies to those.


Correct. All are songs that are primarily sung by a guest vocalist, but are generally billed as songs by instrumentalists (Kirk Whalum, Herb Alpert, Kenny G, Joe Sample and Kenny G respectively).