From opera diva Karita Mattila to Lady Gaga, from Broadway's Mandy Patinkin to pop star Jason Mraz, singers are doing yoga, and experiencing its ability to free their voices and psyches. Yoga provides bountiful rewards for singers: the practice of rib-opening and spine-lengthening asanas can improve alignment, while spinal twists, pranayama breathing techniques, and meditation can focus the mind and calm performance anxiety. Some singers have turned...