Related Clues:

• They may be vital
• Some are vital
• Periodicals
• Hearts, e.g.
• Hymn-playing instruments
• They can get pretty loud in church
• These can be vital
• Appendixes, e.g.
• Instruments with stops
• Church features
• Keyboard instruments
• Church instruments
• Bach may be played on them
• Spleen, etc.
• Synthesizer ancestors