The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Jeremy Hunt:
Vocal Tech is an interactive guide to classical singing. It is intended for students of classical vocal music: opera, oratorio, song literature, etc. Any student of singing hoping to build a solid technical foundation can use Vocal Tech. The app discusses Phonation, Resonance, Posture, and Breathing. It includes vocal exercises with recorded examples and a voice recorder for the student, as well as piano accompaniment for exercises. A tenured university professor with a doctorate in voice performance and vocal pedagogy from Indiana University created Vocal Tech.