For the Different Drummers score, the directors desired to take advantage of the flavor of music from the mid-1960s, that being the time period of the story, but also wanted to avoid the fade-in/fade-out effect which is a common downfall of using prerecorded period music in a movie score.
Greg Gower, an expert on the recording and playing styles of the 60s, provided the songs and lyrics, tailoring them for the specific scenes and fashioning them after some of the standout artists of the mid-1960s. Gower went to great lengths to recreate the tone and feel of the 60s music, using the recording techniques of the time as well as the actual vintage instruments and vocalizations to recreate the distinct feel of that era. At the same time, the songs retain a distincly original edge that the directors were looking for.
Caron fashioned an orchestral underscore that seamlessly integrates with the songs such that a listener/viewer can't be certain where the score ends and the songs begin. The result of their combined energies is a soundtrack that delivers the best of both worlds, providing the flavor of the period while always remaining uniquely integrated with the storyline.