The vocals of Ice Cream Spiritual have drawn comparisons to a singer who was married to what member of the Beatles?
Ice Cream Spiritual:  The guitar work has drawn comparisons to math rock bands, while the vocals have drawn comparisons to Yoko Ono, for their experimental sound. Yoko Ono:  She is noted for being the second wife and widow of singer-songwriter John Lennon of the Beatles.
John Lennon