." >> maurice king, musical director.h cherishes the photos he has of his late great grandfather, a legend at motown records. >> maurice king was pivotal in helping the temptations and the supremes, gladys knight, really helping them own their craft. >> reporter: but he'd never seen the legend in action until he looked on screen. >> gladys knight! >> reporter: at the band leader behind gladys knight and the pips. ♪ i heard it through the grapevine ♪ ♪ not much longer would you be mine. >> she says, hey, that looks like that might be your great grandfather. ♪ i heard it through the grapevine ♪ ⌞> reporter: and there he was. joshua took to social media to share the joy of spotting a family member at the festival. >> he was this really sweet man who always took time to spend time with his great grandchildr grandchildren. >> reporter: for questlove, stories like that one make it all worthwhile. >> i love the accolades, but for me the payoff is, without a doubt, just the opportunity to connect people, for people to see what th