Hey, I was just reading this article at Guitar Noise and it says: "In this song, the bass follows the lead guitar, echoing the riff and reinforcing the punchy 1-2 beat. But if you listen closely, youll hear that the bass is not playing exactly the same riff as the lead. Both the notes and timing are different. There is an extra note inserted. Now this is where some knowledge is required, as well as some listening. The chord change is D-G, and the song is in D-major (at least in my band). The guitar riff is D-E-F, so I would start by using the E to get from the D to the G (which is using the Box). But we need an extra note. It seems likely that it is either F or F#, and since were in the key of D, lets try F#. Sure enough it works. Youll need to review some theory to figure out why the guitar plays an F and the bass transitions with an F#, but it doesnt all fall apart. Lets just simply say that the guitars F makes a G7, which is a common rock/blues chord, but the bass wants to stay in the key of the song. Also note that the bass arrives at the G on the 1-beat, while the guitar gets to the F a half-beat before the measure. The guitarist is using anticipation, and it is very common for the vocal or lead guitar to use it, while the bass generally does not." I am not sure why he chose to play those notes. So I'm wondering if anyone knows any books that are based on how to choose what notes to play in a song when you are just given the guitar chord (remember I'm a beginner). And what does G7 mean? Thanks.