Another great 4 Chords only popular song

Creep - Radiohead
https://m.youtube.com/watch?v=XFkzRNyygfk#fauxfullscreen
https://m.youtube.com/watch?v=lZiNtbgm9oM


No ordinary chord progression.


The first bass heard is G. This indicates the song is written in G. It is the G major key. The G major key has all F, F sharp.


Then bass becomes B. The 3rd ie D played D# so the chord is B major. So it seems the song had modulated to the E minor key which is the relative key of G major.


But third chord is not E minor. It is C major.
C bass and E G C.


And then the principle of least change in music.
C bass and Eb G C ie all notes same except E which becomes E flat. This changes the C major chord to C minor. A very nice trick used on Moonlight Sonata - Beethoven, between 9th and 10th bar, E major changing to E minor.


So there it is, just 4 chords, not trivial ones.


The melody again plays a major role. For example the vocal may sing B while the bass is C creating the fabulous sounding C major 7th.