Videos

Breathing exercises for musicians - Nuria Cabezas Castaño

Ultrabreath exercise for lung capacity - Nuria Cabezas Castaño

Breath builder - Nuria Cabezas Castaño

4-7-8: 10 minutes of calm breathing exercise - Hands-on-meditation

Breathing for singers - KHansenMusic

Music breathing Exercises - Classroom Composers

Articles:

Diaphragmatic breathing

The Immediate Effects of Short-term Exercise on Diaphragmatic Breathing over Wind Instruments

The validity and efficiency of breathing exercises to reduce music performance anxiety in the music classroom

Web: 

Top 5 breathing exercises for singers

Breathing Exercises for singing