Rock icon and 1960s counter-culture hero Bob Dylan suggested recently that he might enter into the sat nav market as a voiceover artist. Sound bizarre? Well he's not the only rock star with an entrepreneurial streak. There are a host of them currently punting everything from scents and sauce to shoes and soft drinks. Have a look at our selection of some of the most weird and wonderful product lines, and unusual music merch that the stars have been hawking.