That's Catty Noir singing: "I like to dream yeah...." If you watch the full movie, you hear her sing: "Close your eyes ghoul, look inside ghoul. Let the wish take you away"
Now if you were born in the 1950's, you may have heard that before, listen to the song below, familiar?
That's "Magic Carpet Ride", by Steppenwolf. Song was released waaay back in 1968, it hit #3 on the charts, and was their second-most popular song. Their #1 song was the unforgettable "Born to be Wild".
Wikipedia mentions the cover: "Featured at End Of Monster High 13 Wishes Movie Covered by character Catty Noir."