"Electric Zoo" is a techno/breakbeat song heard in the episode "Krab Borg." Mr. Krabs listens to it while counting his money, to great enjoyment. He seems to love the song, as he asked the radio station to play it again. This song is also the episode's title card music.
The song's title is said by a radio DJ. Despite the title being "Electric Zoo," Mr. Krabs basically calls it "the one that goes Beep boo-doo bop boo-doo beep," making SpongeBob confused because, only hearing him say this misunderstood title, he thinks that Mr. Krabs is a robot.
The song was composed by series writer/executive producer Paul Tibbitt and solely uses instruments.
An announcer on the radio said the song's name before it came on, but Mr. Krabs did not appear to know its name when he was asking the radio station to play it again. Though, it is possible he wasn't fully paying attention or that he may have forgotten the title of the song. He may have gotten hooked to the song, only after it started playing.
There are other songs in real life that are known as "Electric Zoo," possibly influenced by this song, or perhaps this song was influenced by those songs.
This is the first song that Paul Tibbitt wrote.
Electric Zoo is also the name of a famous EDM music festival held annually in New York City. However, "Krab Borg" came out in 2002, while the Electric Zoo Festival debuted in 2009. http://electriczoofestival.com/