1. Gordon Lightfoot - Sundown: Sets a melancholic, slightly suspenseful tone fitting for a murder mystery's opening or a reflective moment.

2. Prince - Little Red Corvette: Provides a contrasting element of sleek, seductive energy, perhaps representing a character's hidden desires or a deceptive facade. The song's rhythmic drive could underscore a chase scene or a moment of heightened tension.

3. Bob Seger - Roll Me Away: The bluesy, slightly mournful tone of this track lends itself to scenes of regret, loss, or the weight of secrets. It could accompany a character grappling with guilt or the aftermath of a crime.

4. Bob Dylan - Knocking on Heaven's Door: A classic choice for a murder mystery soundtrack, this song evokes a sense of mortality, desperation, or a character's impending doom. It could be used during a climactic scene or a character's final moments.

5. The Doors - Light My Fire: The psychedelic and intense nature of this track could accompany a hallucinatory sequence, a scene of heightened emotion, or a moment of revelation. Its dramatic build-up could underscore a crucial plot point.

6. Donovan - Atlantis: This folk-rock track offers a mystical and atmospheric quality, suitable for establishing the setting of Idaho or creating a sense of mystery and the unknown. It could be used during a scene set in a remote location or to emphasize a supernatural element.

7. Simon & Garfunkel - April Come She Will: The gentle, melancholic beauty of this song could accompany a reflective scene, perhaps a character's reminiscence or a moment of quiet contemplation amidst the unfolding mystery.

8. Johnny Rivers - Rockin' Pneumonia and the Boogie Woogie Flu: This upbeat, slightly quirky track could provide a moment of levity or contrast, perhaps during a scene involving a red herring or a moment of unexpected humor. It could also be used to underscore a scene of frantic activity.

9. Additional Tracks (to fill the playlist to a suitable length): To complete the playlist and maintain thematic consistency, consider adding tracks from artists like:

   • The Band: Their blend of folk, rock, and country would fit the Idaho setting and the overall mood. Songs like "The Weight" or "The Night They Drove Old Dixie Down" could be particularly effective.
   • Crosby, Stills & Nash: Their harmonies and folk-rock sound would complement the existing selections.
   • Joni Mitchell: Her introspective songwriting and folk-influenced style would add depth and emotional resonance.
   • Fleetwood Mac (early work): Their bluesy rock sound could add a gritty edge to the playlist.
   • Creedence Clearwater Revival: Their swampy rock sound could evoke the atmosphere of a rural Idaho setting.

The playlist should be sequenced to create a dynamic listening experience, alternating between high-energy tracks and more melancholic or atmospheric ones to reflect the ebb and flow of the mystery's narrative. Consider the emotional impact of each song and its placement within the overall story arc.