Sure, be obtuse. All three don't play instruments. Their singing voice is supposed to be their instrument. And they're incomparable:
Tom Jones can really sing. And I'm pretty sure you can see a band playing behind him.
Janet Jackson needs autotune and a sh*tload of dancers to distract you from her 'singing'.
Paula Abdul is a dancer and choreographer, not a singer. Like Janet > autotune and dancers and probably a backing tape as well.
Please come back when you have a better taste in music than Milli Vanilli and their ilk. You're embarrassing yourself revealing that you saw Paula Abdul 'live'. Even confessing to a RuPaul Drag Show attendance would be less shameful.