In The Marvelous Musical Mansion Reviews
I remember somewhat about it. These kids go with their aunt (who amazingly came back from Timbuktu!) to visit their Uncle Rubato in his mansion, where every AMAZING room has singers and dancers, and yet more FANTASTIC stuff like Piccollo Pizza and Piano Pudding (seriously, you should be thinking this is stupid by now).
...Do I need a review for this? It's horrible. Yet another song-filled, crap-ified piece of trash aimed on an audience of 1-year olds. Don't let your kids watch this, they may be scarred for life by the trash in this so-called "film" that's really just a low-budget straight-to-video piece of crap.
And yes, that's how bad this movie was.