we had danny do a few test tracks to see if his style could fit what we wanted to do but sadly it just wasn’t working. we wanted a more living studio sound and i really wanted a lot of singing and creative lyrics that fit the games theme, this wasnt something danny was able to do so i contacted Matthias (the intro voice of isaac) about doing some test tracks. the 1st track he sent me is the one we used in the intro trailer for the game.. and he made it in a day (he actually made 2, the 2nd was the title screen track http://www.youtube.com/watch?v=pgTSElbhtfU ).
obviously we were very sold on Matthias work and will probably be using him a lot in future games.