\relative c'' { a1 a a % place in bottom layer -\tweak layer #-1 -\markup { \with-dimensions #'(0 . 0) #'(0 . 0) % specify color \with-color #(rgb-color 1 0.5 0.5) % specify size \filled-box #'(-2 . 2) #'(-2 . 7) #0 } a }
Well on the background thing... I have no idea how to move it... But it is somewhat of the size that would be needed now I guess. But the other option of just coloring the Clef seems easier as far as I can see, if you need to used coordinate every single time to move it on the paper.
Is there a way to make a color glow from an image? :) I actually need something of that sort for the colored notes.
Dearly regards Darkijah