Sing and PlayTheory Things   William Wieland
C major Cadence Pattern Chords in C major for "This Old Man", "I'm a Little Teapot", "Silent Night", and many other songs
All 12 keys: Major Cadence Patterns - TriadsMajor Cadence Patterns - V7 chordsMajor Cadence Patterns - full V7 chords

The following tunes are roughly organized by difficulty beginning with the easiest.
Itsy Bitsy Spider only 2 chords!
This Old Man a choice of 4 keys
Silent Night a choice of 6 keys
3 Songs . . . which use the same music!
Jingle Bells including a secondary dominant
I'm a Little Teapot a straightforward version and a fancy version
Thousands of song lyrics with chord symbols can be found on the internet.
Simply search for a title. (Add "lyrics" and "piano chords".)