Rhythm or lead guitar?
Just curious.
ESP LTD EC-1000 vintage black
sunburst fender MIM tele
Epiphone LP standard ebony
Mesa/boogie dual rectifier
Mesa/Boogie .50 caliber plus head
Marshall JCM900 Hi-gain MII 2500
Fender Hot rod Deluxe
It really can go either way. If you write a lead that has a strong melody line, that can start you off in the direction of a progression to go with it. I think most people tend to write the rhythm first, but there are no absolutes. People write songs in a million differerent ways