The most expensive guitar ever is the guitar and it costs over $2,700,000 because Eric Clapton, Keith Richards, Mick Jagger, Ronnie Wood, Brian May, David Gilmour, Jimmy Page, Jeff Beck, Mark Knopfler, Pete Townshend, Tony Iommi, Angus Young, Malcolm Young, Sting, Ritchie Blackmore, the members of Def Leppard, Bryan Adams, Liam Gallagher, and Paul McCartney signed on it.