I'm working with a (willing to learn) guitarist who I want to join my band, but right now he's got some playing issues. he seems to be pretty good because as far as bar/power chord playing he held up in another band for a while, but when i showed him some of the stuff my group was doing he seemed like he wasn't too quick. he prettymuch has powerchords (rock chording to say the least), pinch harmonics, and some shredding under his belt right now. now, the reason why i'm posting on a bass forum about this at all is I recommended to him that "You should learn how to play one string at a time, like a bass player, and then integrate the speed you have from that into playing power/barred chords". I'm thinking what he needs is a reintroduction into getting fluent on a fretboard, and he needs to work on developing melody on the lower pictched four strings on his guitar (i asked him to play something of his style and got a deer in the headlights look. in his other group the drummer did writing). are there any online bass (or even guitar) instruction books i can suggest to this self taught player to learn from?