Dave Grohl has opened up on how his daughter provided backing vocals on the latest Foo Fighters record, as well as his high hopes for her future musical ambition.Violet, 14, provided backing vocals on the Foos’ tenth album ‘Medicine At Midnight’ after hanging out with the band at a “funky old house” in California where they recorded their latest album.“At around two or three o’clock [every day] I would take a break and go pick her up from school,” Grohl told the BBC.