If you like music from the late 70's and 80's, I'd highly recommend Tatsuro Yamashita. His music spans a few genres like, pop, funk, doo-wop, soft rock. He has an incredible voice and is married to Maria Takeuchi, who is also a pop singer. Here are a few songs I like...
"Downtown" by Sugarbabe (Tatsu's 1st band) from SONGS (1976)
style: pop
*this song has been covered many times by other J-Artists
"Ride on Time" from RIDE ON TIME (1982)
style: pop ballad/light funk groove
*one of his biggest hits*
"Dancer" from the album SPACY (1977)
style: smooth funk groove
"Love Space" from SPACY
style: pop ballad/light funk
"Paper Doll" from GO AHEAD! (1979)
style: smooth funk
"Gone in the Wind"
style: pop
Any questions let me know. Hope you enjoy at least 1 of these. Take care ^_^