Hello Karynette. On sheet music without the key of F, the chords are notated as follows: C=Do, D=Ré, E=Mi, F=Fa, G=Sol, A=La and B=Si. When the chord is marked G, play the G Major chord. When marked Gm, play the G minor chord, and when marked G7, play the G 7th chord. When it's G/D, you play a D bass and a G chord. I hope this answers your question.