"Song VII" isn't the most exciting title around, but it's important for a number of reasons. First, the word "song" is in the title. This clues us into the fact that this poem is somewhere between music and poetry (the two do have a lot in common, after all). It also clues us into the fact that this poem is part of a series of "songs." In fact, "Song VII" is part of a series of songs by Tagore—all dealing with the divine.
But the title is important in another way. It's a very simple title. And since this is a poem about the importance of simplicity, the title itself can be taken as an example of simplicity. It doesn't get much simpler than "Song VII." Maybe "Song VI"? But that's a whole other poem, Shmoopers.