Remember when Kids of The Kingdom used to be the default singers for both Walt Disney World and Disneyland when it comes to parade, events, and shows between the 1969 till the late 1980s (as late as 1989 with "One Man's Dream").
I believe they were also heard on the VHS Tape "Disney Sing Along Songs Disneyland Fun" tape.
I found this page from DisneyChris (a website dedicated to previous shows and parade music at Disneyland) that has most of songs performed by Kids of The Kingdom (best known for "Disneyland Is Your Land").
www.disneychris.com
Kids of The Kingdom alongside Jack Wagner were the perfect representation for anything "Disney" for both parks during the 70s and 80s. You don't seen any announcers or singers this charming anymore. I'm surprised Disney hasn't attempted to revisit the "Kids of The Kingdom" for a new generation.