One of the best sources for hymnological study is the Calvin Hymnary Project http://www.hymnary.org/.
I use it every day to find texts, tunes, authors, composers, hymnals, meters . . . it's all there . . . like having a stack of hymnals and encyclopedias at my desk. I still do have a stack of hymnals that I'm using all the time . . . 18 at last count.