Best way to get to union station from the sound academy?

If you want to take transit, TTC route 72 southbound stops at the NE corner of Commissioners St and Cherry St on its way to Union Station - late evening service runs every 24 minutes until 1:33 AM. Get off at Bay/Front and go to the subway station (the entrance on south side of Front west of Bay is probably easiest). Take the subway north via Yonge to Finch, then take route 60 to Bathurst/Steeles. Last train from Union leaves at 1:42 AM - if you get there after that, take route 320 from the stop on Front just east of Bay to Yonge/Steeles, then walk west on Steeles (no night service west of Yonge on Steeles). You could also take one of the downtown night routes west to Bathurst, and then route 310 all the way to Steeles.