This is week 20 of WSC.  Mary’s three prompts this week is to pick songs written by Barry Gibb, Prince, and Ed Sheeran.   No need for the mid-week blues, when we can rock it!  SecondHandSongs reports Gibb has solo penned or collaborated with his brothers more than 150 song titles.  I don’t know how accurate that it but scrolling through the list my eyes instantly fell on one of my favorite songs released in 1977, the #3 Billboard Hot 100, Emotion by Samantha Sang.   The authors of these prompts are well established vocalist so I decided to find songs written…