of traditional and contemporary liturgical forms. Springing from its revered heritage in the Lutheran chorale, the musical life of ELCA congregations is just as diverse as its worship. Johann Sebastian Bach, the most famous Lutheran composer and African songs are part of the heritage and breadth of Evangelical Lutheran church music. The musical portion of the Lutheran liturgy includes metrical psalter, metrical responses and hymns. Evangelical Lutheran Worship has ten settings of Holy Communion, for example. They range from plainsong chant, to Gospel, to Latin-style music. Congregations worship in many languages, many of which are represented in Evangelical Lutheran Worship. Other books used in ELCA churches include the Lutheran Book of Worship (1978), and its supplements: With One Voice, This Far by Faith, and for Latino/Hispanic congregations: Libro de Liturgia y Cántico. Ecumenical relations The ELCA is a member of the National Council of Churches, the World Council of Churches, and Christian Churches Together and is a "partner in mission and dialog" with the Churches Uniting in Christ (formerly the Consultation on Church Union) formed in 1960. Full communion The Church maintains full communion relationships with other member churches of the Lutheran World Federation (which is a communion of 140 autonomous national/regional Lutheran church bodies in 78 countries around the world, representing nearly 66 million Christians) which was reorganized in 1948 from the earlier Lutheran World Convention of 1923. The ELCA has additionally full communion with the Episcopal Church, in which several congregations are jointly affiliated and hold mixed services. Also the ELCA has since established official full communion relationships with other Christian denominations such as the Moravian Church in America (with the exception of the Alaska Province), the Presbyterian Church (USA), the Reformed Church in America, the United Church of Christ, the Episcopal Church, and The United Methodist Church. In 2013, the Ethiopian Evangelical Church Mekane Yesus severed ties, including communion and pulpit fellowship, with the ELCA over the issue of practices and teachings connected with homosexuality. Roman Catholic Church On October 31, 1999, in Augsburg, Germany, the Lutheran World Federation – of which the ELCA is a member – signed the Joint Declaration on the Doctrine of Justification with the Roman Catholic Church. The statement is an attempt to reconcile a historical theological divide between the two communions. The Declaration also states that the mutual condemnations between 16th century Lutherans and the Roman Catholic Church no longer apply