Bill Douglas vocal etudes (for building skills in rhythm)
In this google folder you should find a pdf of the music, and recordings (by Bill Douglas) of each in both a slow and fast format. Shared with the very kind and generous permission of Bill Douglas
These are recorded sounds to improvise or play scales with to think more carefully about intonation in a key
Walfrid Kujala: Vade Mecum, basic scales warm up