Possible Clues:

• Vocal required in revolutionary hymn
• Blend of notes, almost bitter, say, in vocal music
• With Carlo he produces tune
• Work of harmonisation is painful task after Article 50's introduced
• Stately hymn
• Harmonious group
• Bach's music? It was sung in church or it was enjoyed in taverns
• Hard task including a learner in hymn tune
• What needs, alas, to be done about a line in hymn
• Men having beer after church -- where this is sung?