although he continued to write music, martin found himself gravitating to the business side of the music industry by the 1980s. also, in 1980, he became (youngest ever) captain of the rac golf club in epsom. his partnership with coulter ended in 1983 when martin bought out coulter's share of the business. he later sold the company to emi. in his business career, he successfully built up and sold numerous companies in such diverse fields as music publishing, marketing and properties. he once owned the rights for van morrison and east/memphis music corp., which he sold respectively to chappell music and rondor music catalogue.