When I accompany someone singing, I play this 1-4-5 pattern. I play it the same way in every key, I get by with it on alot of songs. BUT sometimes I need to add one or two chords to it, that will work and lead back smoothly to the one chord.This is how I play the 1-4-5 that works for me almost everytime
key C C/ C E G 1
F/ C F A 4
C/ C E G 1
G/ B D G 5
I just keep repeating it over and over. I NEED SOME HELP ON THIS, I THANK YOU IN ADVANCE