This is the official repository of all songs in the Psaltério (www.psalterio.net). All songs are written in latex files which enables a high tipografic quality, example: Separata IMPACTO 2014 but it also creates the database of songs for the psaltério website and Apps (iOS e Android). It's 3 em 1 :)
There are several ways to help. Typically these are the main tasks:
Segue as instruções neste link: https://github.com/psalterio/repository/blob/master/README-PT.md