Pop Rock (5283) is a versatile backing track for Guitar (or any soloist!) in G major, 120bpm.
The following chords appear in this track:
G major = tonic = 1 = I
F major = subtonic = b7 = bIIV (a whole tone below the tonic)
C major = subdominant = 4 = IV
D major = dominant = 5 = V
E minor = relative minor (of G major) = 6m = VIm
Play along, improvise, have fun!