Comment by phillmv

That's because they focussed on the most likely end-user experience:

>While Motown shortened song to fit into radio time, the company also produced records specifically with car radio audio quality in mind. Motown recording engineers set up car speakers in the studio so that they could simulate and perfect how a song would sound emanating from a car radio

- what's the point of engineering things to a set of conditions virtually none of your target audience possesses?

http://web.wm.edu/amst/370/2005/sp3/machinery_marketing.htm