"What Is This Feeling?" is a song from the musical "Wicked" and is sung by the characters Elphaba and Galinda. The song is about the two characters initial dislike for each other, which later develops into a friendship. The lyrics describe the feeling of loathing that the characters have towards each other, with lines such as "My pulse is rushing, lets just say my head is reeling, we loathe it all". The song is known for its catchy tune and witty lyrics, and has become a popular song from the musical.