I once dated a girl whose dad played a CD in the car. It consisted of a palm-muted bass guitar, plucked with a plectrum; little plodding bass lines - it could have been a keyboard with that effect. At the forefront was woodwind, what sounded like pan pipes or two flutes playing a melody in harmony with one another. Track I most remember was in 4/4, 60 bpm, key of Bb major, easygoing/carefree tone and feel. The style sounded mid-20th Century American to me so I referred to it as "Americana", which I doubt is the correct umbrella term. I regret that I don't remember much else and can't provide a more detailed description. Any help appreciated!

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EDIT: No vocals or percussion; what I've described is all I remember hearing.