On Top of Spaghetti by Traditional is played in the key of G at a beginner difficulty level, originally released in the 1960s. It uses 3 chords — G C D — arranged in the I-IV-V progression.
About the I-IV-V progression
The I-IV-V progression uses the three primary chords of the key — nothing else. It's the harmonic foundation of blues, folk, country, and early rock and roll. Learning to switch between these three chords fluently in every key is a fundamental milestone for beginner guitarists.
Playing in the key of G
G major is one of the easiest keys on guitar. Its primary chords — G, C, and D — are all open first-position shapes, and the relative minor (Em) is one of the simplest grips on the instrument. A great key to spend time in as a beginner.
Related songs
More songs in the key of G
More songs using the I-IV-V progression
Learn to play On Top of Spaghetti by Traditional on guitar. It sits in the key of G and uses the I-IV-V progression with the chords G C D.