I'm never convinced when Protestants claim to be people of the Bible alone. They are people of the Bible and the hymnbook, and the two volumes complement each other splendidly. As you sing, so you believe and so you pray—and so you learn much of your theology.
As Christian churches grow around the world, it is not surprising to find an astonishing efflorescence of hymn composition. We must avoid the loose term hymn writing, as so many of the creators are primarily oral artists, and only gradually do their works find their way into written form. But however they are made, the sheer abundance and quality of those hymns is overwhelming, whether in Yoruba or Swahili, Tamil or Zulu. Arguably, we live today in the golden age of Christian hymn-making.