I remember! I had Mr. Rossi's Dreams on video when I was little. The opening theme was pretty much like this but sung decently in English. And it got trippier and trippier from here. It was filled with songs, all of which surpassed this one for strangeness, and there was no point to anything. It was all just weird daydreams. And then he catches on fire in Allegro Non Troppo, a very depressing parody of Fantasia with animation done by the animator who invented Rossi.