Sung Eucharist always meant the 1662-style service. Besides the above elements, a hymn would be included for a processional in, the the Commandments would be chanted a capella by the choir to Anglican chant form, with chanted response by the congregation to each commandment; addition collects would be chanted or said, the Psalm would be chanted and a “gradual hymn” added before the gospel reading, the Credo would be chanted by the people with organ accompaniment, an offertory hymn would be added after the sermon, with a chanted doxology following the offertory procession, additional petitions would be included in the prayers of the people, the Sursum Corda would be chanted a capella (English plainsong this time, rather than Anglican chant) with responses chanted by the congregation and the benedictus chanted; Agnus Dei and other canticles would be chanted by the choir during the communion; the Lord’s Prayer would be chanted, the priest would chant the prayer after communion and the people would chant Gloria in Excelsis; and after the Blessing a recessional hymn would be added. The most common chant forms used were James Merbeck’s Anglican chant with his original English plainsong form for the sursum corda.
– Since liturgical reform, “Sung Eucharist” usually uses modern diatonic ‘chant’ forms and usually more liturgical elements are said, with only a few being chanted: usually the Agnus Dei, Gloria (which is moved to the front of the service) and the Lord’s Prayer. It’s relatively rare nowadays to chant the Psalm and the Credo, and it’s vanishingly rare to hear either English Plainsong or Anglican chant. Also in modern services, the gradual hymn is often replaced by a gospel acclamation.