Well, I looked at a bit of one clip and was immediately reminded of the whininess of Donny Osmond's cover of "Puppy Love", although Marie Osmond's "Paper Woses" was infinitely worse. However all of the Osmonds could sing a bit even if I didn't like them.

However, if you want real weak wailing whiney crap you need to re-hear anything by Davy Jones of the Monkees (put into the TV series for his cute face) or indeed anything other than "Let's Dance" by Chris Montez.

Rory Storm couldn't sing to save his life, and Marianne Faithful's attractions were not at the vocal end of her digestive tract.   Matt Monroe (whose work I hated) and Clinton Ford (ditto) could sing the arse off Dickie Valentine or Pat Boone.

Probably the last time the music industry gave a stuff for the musical talents of recording stars was the heyday of the "girl groups" from the race music and early soul days. There are indeed a few women from then some of whom looked like the east end of westbound agricultural impliments who were simply fantastic musicians. That's rare today although both Aquilera and Pink are pretty decent singers.