Radio Josh Groban you can listen on this page of our site. Station work in genres: Discography. Joshua Winslow Groban - American singer, musician, film and theater actor, one of the most sought-after artists of the United States.. Radio Josh Groban has a rating 5.0. Broadcasting country: USA. The station was rated by 1 listeners. Radio Josh Groban you can also listen in the FMCUBE app for Android.