Tonic Triad Drill with Letters (in C) Theory Things   William Wieland
Each letter followed by a comma is sung as a quarter note, all others are eighth notes. This exercise can be sung as a canon.

E
CCCC.
GGGGG,    
EEEE,    
CC,    

EE,    
CCCC,    
GGGGG,    
EEE
CC.