for a christian faith and hope go together like sisters. you kinda need one to comfort the other. if faith is 'things hoped for' - then we haven't realized them yet. and may never in this lifetime. so, that could be depressing if we didn't have faith.
for instance, for me, i will never stop trying to be a really good pianist - but if i never measure up to my teachers standards for me - i'll just well die. i'll become a boozer and --- wait . no...i can't do that. something holds me back. i think it's realizing that maybe piano isn't everything. it SEEMS like everything - but i have a family and responsibilities so i can't just give up. but - i will secretly do it. i know i will. (not the booze part - the piano part)
*i think music brings hope to the world because it seems to accompany joy and love. which are fruits of the spirit, too.