♪ even though i'm up in the cell ♪ ♪ it's like [ bleep ]. for one inmate, doing time at the santa rita jail offered him an opportunity to find a collaborator and an inspiration to compose a new rap about his circumstances. >> yeah, i'm in lockup ♪ ♪ sitting in county jail ♪ i'm a star ♪ i'm in the santa rita should be playing tennis with serena ♪ ♪ but i should be in my own room ♪ ♪ i wouldn't feed three dogs ♪ ♪ i'm in lockup ♪ lock u-p ♪ on msnbc ♪ l-o-c-k-u-p on msnbc.