27.2The famous “oom-pah-pah”

That is essentially:

bass – chord – chord

For C:

C | E-G-C | E-G-C

For G:

G | D-G-B | D-G-B

For Am:

A | E-A-C | E-A-C

For F:

F | F-A-C | F-A-C

This is the simplest waltz texture.