Deacon Blue Star A Hit At Cornton Vale Prison. The Scotsman 5th September 1998 JOHNNY Cash, most famously, did it in San Quentin. Two months ago, the British award-winning singer, Finley Quaye, was at it in Greenock.  Yesterday, it was the turn of Ricky Ross to go behind bars to entertain the prisoners, when he played before 100 inmates at Cornton Vale.  The former Deacon Blue singer was brought in to Scotland's only women's prison to boost morale in the wake of seven suicides among inmates in the past three years.  Ross agreed to do the solo concert as a favour to a female friend who works at Cornton Vale.  For two hours the women, were treated to a string of old Deacon Blue hits, including Dignity and Chocolate Girl.  Backed by two local guitarists, the Dundee-born star sat in the middle of the gymnasium with a piano and an acoustic guitar.  The inmates, who sat in a semi-circle around him, were given the afternoon off their chores to enjoy the concert, which kicked off with the REM hit, Losing My Religion.  Irene Robb, the head of the prison's entertainment committee, said: "We have had a number of local performers here before but I think Mr Ross is the biggest star we've had."