Hi i was just reading the notation for the 12 bar blues lesson 2 in the "more 12 bar blues in A" section of fundamentals 2 i still cant get my head round the time sig it says 4/4 yet i seem to be playing an 8th and a 16th note for each quarter note? also when the small riff with the C ,C sharp and E they are still written as 8th notes which doesn't add up to 4 quarter notes! As this message doesn't seem to make a whole lot of sense i'm sure u can tell i'm very confused any help would be greatly appreciated!

Thank you in advance
Adam