All JETHRO TULL albums are worth listen to. Heavy progressive with flutes. Start with this one for example. One long suite. The original PAssion Play, remixed by Steve Wilson.
01 Lifebeats / prelude 02 The Silver Cord 03 Re-Assuring Tune 04 Memory Bank 05 Best Friends 06 Critique Oblique 07 Forest Dance # 1 08 the Story of The Hare 09 Forest Dance # 2 10 The Foot Of Our Stairs 11 Overseer Overture 12 Flight From Lucifer