Steve, I pretty much have the guitar by my side when I'm home from Uni when I watch TV etc. as its the most effective way to learn, you're thinking about the guitar but not 100%. Its the way I learn things atleast, same with Uni work to be honest.
As for Pentatonic scales, I know them somewhere in the back of my mind but if I'm honest they aren't a big player in my music. They excellent for working on playing the guitar, and are good to listen to where notes fit in but overall, its just a sequence of notes which once you know them, you know them and they don't really get involved again. Saying that, if you're going to be writing you own music (something which I do now and again) you may use them, or just recall back to it. Personally, I don't, but guitar playing isn't "one fits all," its very unique to the individual. (Just to add, I know Pentatonic scales are the breakdown of Chords, so in a round about way I do use them, but as far as the sequence goes, I don't
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Tell you what, its 02:15am, and I really wanna play now, but seeing as its -9 outside and the mother has work tomorrow, getting kicked out for big noisey isn't on my to-do list.