THEORY BOOSTERS: NAMING WHITE KEYS
Lisa Bastien / Arr. Lori Bastien
THEORY BOOSTERS: LINES AND SPACES NOTE SPELLER
Lori Bastien / Arr. Lisa Bastien
Piano Theory Lessons - Level 1 - (Dutch Language)
Jane and James Bastien
All for Strings vol.2 (english) - Theory Workbook - Cello
Anderson / Frost
All for Strings vol.1 (english) - Theory Workbook - Cello
Gerald Anderson / Arr. Robert S. Frost
Piano Safari for the older Student - Sight Reading & Theory Level 2
Katherine Fisher
Tasten- und Balginstrumente