First Post · Jethro Tull Nightcap - The Unreleased Masters, 1973 - 1991 ℗ 1993 Parlophone Records Ltd, a Warner Music Group Company Drums, Percussion: Barriemore Barlow Flute, Mandolin, Tin Whistle: Ian Anderson Acoustic Guitar: Ian Anderson Lead Vocals: Ian Anderson Backing Vocals: Ian Anderson Bass Guitar: Jeffrey Hammond Backing Vocals: Jeffrey Hammond Hammond Organ, Synthesizer: John Evan Celeste Piano: John Evan Electric Guitar: Martin Barre Writer: Ian Anderson