[Genre: Western / Film Score]

[Tempo: 75 BPM]

[Key: E minor]

[Instruments: Whistling (lead, natural and airy), Acoustic Guitar (fingerpicked, open chords)]

[Mood: Desolate, heroic, lonely, vast]

[Effects: Light reverb (open plain), whistling with slight vibrato, guitar with warm sustain, distant wind ambience]

[Description: A sparse, evocative western piece. A lone whistling melody drifts over a slow, arpeggiated acoustic guitar. The music captures a cowboy riding into the fading light, the vast emptiness of the prairie, and the quiet resolve of a drifting gunslinger. The whistling fades like wind over dry grass.]