The jocks were singing up a storm last night at Karoake night. Today they were involved in a bit of a juggling act with some last minute rider switches prior to tonight's Whitney draw as Irad Ortiz Jr. will remain in his regular spot on Diversify, Javier Castellano to ride Backyard Heaven and Ricardo Santana Jr. now named aboard Dalmore.  There will be eight starters in Saturday's Whitney with the post position draw scheduled to take place at 6:00 p.m.