I'm a little late on this one (watching eps on itunes instead of waking up early on the weekends), but I too thought Go Through the Portal was a wonderful song. In fact the whole "Root of Passage" was perhaps my favorite half-episode so far. Root is just adorable, so yay or him being featured, I loved the song, and John sang it as a solo, allowing him to show off his voice.
Also love the little in-jokes in the shows, i. e. "not a key change" during Sprites Sleepover.
And I don't think I posted it here, Seymour is Batley! I'm not way too excited about that btw.
"If there was a Mount Rushmore for Broadway scores, "West Side Story" would be front and center. It snaps, it crackles it pops! It surges with a roar, its energy and sheer life undiminished by the years" - NYPost reviewer Elisabeth Vincentelli