I am big fan of Voight not just because of his talent and political leanings, but because I also have a "six degrees of separation" connection to him. My wife's uncle attended Catholic University in D.C. and his room mate was - Jon Voight.
Chip Taylor also wrote "I Can't Let Go" - a HUGE hit for the Hollies and later covered by Linda Ronstadt.
The "Hollies" with a young Graham Nash. I saw them on their first US tour at a teen night club in Dayton,OH - the admission was $1 and the stage was 12" high.