Pretty short list of players. Looks like a slant towards electric guitar though. And, the father of the electric guitar (Les Paul) was quite the shredder so you need to add him. Tommy Emmanuel on an acoustic would be a top contender. Chet Atkins needs to be there as well. Andre Segovia is another. There must be 1000 Flamenco and Classical guitarists who'd top the current list too so may I humbly suggest changing the title to Greatest Rock Guitarists?