- 50 Vocal Warmup Exercises (For Bass Voice) · 2008
- 50 Vocal Warmup Exercises for Mezzo-Soprano Voice · 2007
- 50 Vocal Warmup Exercises for Mezzo-Soprano Voice · 2007
- 50 Vocal Warmup Exercises for Soprano Voice · 2006
- 50 Vocal Warmup Exercises (For Bass Voice) · 2008
- 50 Vocal Warmup Exercises for Mezzo-Soprano Voice · 2007
- 50 Vocal Warmup Exercises (For Bass Voice) · 2008
- 50 Vocal Warmup Exercises (For Bass Voice) · 2008
- 50 Vocal Warmup Exercises (For Bass Voice) · 2008
- 50 Vocal Warmup Exercises (For Bass Voice) · 2008
- 50 Vocal Warmup Exercises (For Bass Voice) · 2008
- 50 Vocal Warmup Exercises for Baritone Voice · 2007
- 50 Vocal Warmup Exercises (For Bass Voice) · 2008