Choral Library is a free iPhone app (also runs on iPad) that lets you browse and download works from the Choral Public Domain Library (CPDL). It also shows basic info about the work, including the text when available.
On the iPhone, Choral Library is a lot easier to use than the CPDL website. On the iPad, it’s less necessary because the bigger screen more readily accommodates the CPDL website, but it is still a useful search alternative if you prefer tapping to typing on your iOS device.
Credit: Choral Library
Credit: Choral Library
Credit: Choral Library
Technology for the Classical Singer 