I love driving by the Opera House around 8:00am or so on a weekend...
There is often a concert taking place on the front steps... people driving by pull over to listen and enjoy for a while... and the concerts include a variety of band and musical groups/types.
It's one of those quirky city events that I love. Denver, Colorado has a ton of them and this is one that's special to HCMC in my eyes.
When my brother Lenny first arrived in Vietnam during his visit two Christmases ago, we happened to catch a concert in front of the Opera House then too. A couple photos from that day can be found by clicking here.