The Spoiled Lemon are a band. They made the song A Party. And of course, they are a good band.
Starfruit is the lead singer.
Pineapple plays the electric guitar.
Guava plays the triangle.
Tomato plays the electronic piano.
Lemon plays another electric guitar.
And that grape dude, uhhhhh, plays the drums.
Eventually, they were forced to take a break from playing music and, along with all the other heros team up with all the existing villains in this land in order to defeat the biggest under the name of This is Bob, which seems to be more powerful than the Squid Sisters (the Spoiled Lemon's friends) and all five members of the Yo Gabba Gabba (the Spoiled Lemon's enemies) combined.
Oh wait, Bob IS more powerful than those two combined!
Starfruit seems to be friends with Lightbulb.
A Bloon is a fan of his songs.