 With Daydream , Carey began incorporating urban R & B and hip hop into her music , something very noticeable in " Fantasy . " After Carey began writing songs for her new album Daydream , she decided to include the hook from the Tom Tom Club song " Genius of Love " into an up @-@ tempo song . Afterwards , Carey and Hall began incorporating the sample into the lyrics and melody she had already produced . Carey described how the idea to sample the song became a reality : 
