From 1972's Flintstone Comedy Hour, here's the Bedrock Rockers (Pebbles & Bamm-Bamm's band), performing "Yabba Dabba Doosie". The video has Pebbles, Penny, & Wiggy as fairies, a la Tinker Bell, if you will.
Not exactly on a par with, say for example, Josie & the Pussycats or The Archies, or even Fat Albert's Junkyard Band, who debuted that season. The Bedrock Rockers had debuted on Pebbles & Bamm-Bamm a year earlier as an excuse to pit the titular teens against their fellow toon rockers, even if none of them were going to replicate the success of the Archies' 1968 #1 smash, "Sugar, Sugar". Let's put it this way. While Pebbles inherited her father's penchant for outlandish schemes that didn't always work, despite the best of intentions, she didn't inherit his latent vocal talents.