Information on polyphony in Sweden is mostly connected to polyphony in church music: “Some extant liturgical books used in Swedish religious institutions from 1300 to 1400 and containing music notations give evidence for polyphonic singing at the cathedral of Uppsala in 1298. King Gustav Vasa (reigned 1523 – 1560) eliminated papal control of Christianity in Sweden and introduced the Protestant faith. The reformation resulted in many handwritten hymnbooks that reflected local traditions; in 1697, the first official collection of hymns was published”. According to Ling, the tradition of folk choral singing (both in unison and polyphony) is still alive in Sweden. From the 1800s choral singing became widely popular and many major choral societies were established throughout Sweden. During this period “choral and solo vocal music dominated the local production and reception of music”.