He had a string of hits during the 70's - 80's but is probably best remembered for his 1978 hit Bluer than Blue. RIP.
http://www.rollingstone.com/country/news/bluer-than-blue-singer-michael-johnson-dead-at-72-w492020
http://www.rollingstone.com/country/news/bluer-than-blue-singer-michael-johnson-dead-at-72-w492020