Can you name the artists who have appeared on the Now That's What I Call Music! (US) compilation series the most? Quiz

Can you name the artists who have appeared on the Now That's What I Call Music! (US) compilation series the most?

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Answers do not have to be guessed in order
Voume 1 was released in 1998. Updated through volume 45 (February 2013). Only counts appearances by primary artist. Appearances on special editions (holiday, etc.) do not count.
Also try: Countries with #1 Billboard Hot 100 Singles

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Appearances	Artist
15
12
11
11
11
10
9
9
9
9
8
8
7

Appearances	Artist
7
7
7
7
7
6
6
6
6
6
6
6
6

Appearances	Artist
6
6
5
5
5
5
5
5
5
5
5
5

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