Very nice poem! Music appreciation was a religious duty in those days, and that's where Luther took it from. Reading sheet music involves some work that takes mathematical skills rather than musical ones, and although the notation system has become slightly easier nowadays, there are still excellent musicians who have problems with it. (Every now and then, teachers come up with new methods of notation claiming to be much easier. With computer printers available, reprinting the whole music legacy would be perfectly feasible ... if only the advantage were substantial enough.)

Being able to read sheet music, in the sense of "playing" it in your mind by yourself, is a very valuable skill. Not only does it help you greatly when preparing a performance - vocal or instrumental -, but it allows you to enjoy music even with no sound at all.

Moreover, listening to music and reading the score simultaneously is among the most satisfying music experiences. On YouTube there are countless pieces thus prepared, showing the score and even turning over for you.

Still, most choral singers can profit from computerized learning aids such as the ones Leeneia mentions. Even if you do not really need them, they may save you time. I just saw that CyberBass system for the first time, it looks commercial. What I recommend is ordinary MIDI files such as the ones available from the site LearnChoralMusic - where you also find links to free software that does all you may reasonably want.