'The Flash,' 'Supergirl' musical crossover to air in March

The musical crossover of "The Flash" and "Supergirl" is set to air on March 20.
The crossover will begin at the end of the episode of CW's "The Flash", reported Variety.
The main vocal action will take place on the March 21 episode of the show".
The episode has been titled as "Duet" and it will be directed by Dermott Downs.
It will feature singing acts by Carlos Valdes, Grant Gustin, Jeremy Jordan, Jesse L Martin, John Barrowman, Melissa Benoist and Victor Garber.
David Harewood and Chris Wood will have non-singing guest appearances.
The news about the musical episode broke in August last year.