Question: Who sings that was then this is now?
Answer: The Monkees
Disambiguated annotations:
qaPairs: question: Who sings the song "That Was Then but This Is Now"?
answer: ABC
question: Who sings the original version of the song "This Was Then, This Is Now"?
answer: The Mosquitos
question: Who sings the cover version of the song "This Was Then, This Is Now"?
answer: The Monkees
qaPairs: question: Who sings that was then this is now in 1983?
answer: ABC
question: Who wrote and sings that was then this is now?
answer: Mosquitos
question: Who sings that was then this is now as their comeback single?
answer: The Monkees