What do the blue markets indicate on here...

the empty black circles means open string right, the solid black ones mean you play that note..

but blue?

On the 1st and 3rd they mark octaves. No idea what its about though.
Quote by fukyu1980
LOL ! muther fuker i was gonna say that LOL!
in this case, they're the notes that make the blues scale what it is. the blues scale is just a minor scale, with the flat 5th added - the flat 5th is highlighted in blue anywhere it shows up.