Assertion: hymn's text | /r/HasProperty | indexed by their first lines
Facets:
Source sentences:
text: Since the twentieth century, singer-songwriter hymns have become common, but in previous centuries, generally poets wrote the words, and musicians wrote the tunes; the texts are known and indexed by their first lines ("incipits") and the hymn tunes are given names, sometimes geographical (the tune "New Britain" for the incipit "Amazing Grace, how sweet the sound").