His biggest album on the Billboard 200, it signaled a move toward deeper spiritual themes. Cat Stevens - Tea for the Tillerman

Marked a radical shift to a stripped-down, intimate acoustic sound. Tea for the Tillerman (1970):

Acoustic guitars retain their natural decay, string squeaks, and transient attacks.

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Buddha and the Chocolate Box (1974): This album saw a return to a more stripped-back sound. High-fidelity versions are essential here to capture the acoustic warmth.

If your "upd" includes the recent remasters, you are in for a treat. Early CD releases of albums like Mona Bone Jakon and Tea for the Tillerman were often thin and brittle.

Features remastered versions of major hits spanning his career, available in 24-bit hi-res FLAC Saturnight (Live In Tokyo)

the early 2000s A&M CD rips (loudness war compressed). Look for "2020 Remaster" or "Hi-Res 24-bit" tags.

When audiophiles add "UPD" to their search, they are usually hunting for the most up-to-date, definitive digital transfers available. Over the decades, the Cat Stevens catalog has seen several major remastering campaigns. Knowing which version you have in your FLAC library is crucial. The 2000 Remasters (Ted Jensen)

Programs like foobar2000 (with the Enhanced Spectrum Analyzer plugin) or Audacity allow you to look at the frequency spectrum.