The Bible was sung before it was printed. Psalms were melodies first; the early church carried Scripture in song long before most people could read. 50days simply gives that voice back - every chapter of the Bible, sung near-verbatim from the public-domain World English Bible, by a growing family of voices.
Because we own our masters and the text belongs to everyone, no royalty stands between any person and the Word. Streaming the entire Bible costs about a nickel - so listening is free, for the whole world, forever. Patrons and gift-givers keep it that way.
And running beneath every page is the scarlet thread - the one story from Genesis to Revelation. Follow any thread far enough and it leads to the same place: "they sing a new song... from every tribe and tongue and people and nation."