Did you do what I told you to do last night? Did you record Liev Schreiber’s debut on “CSI” and watch the “Scrubs” musical? (This song might be NSFW)

What fun to hear the actors sing beautifully (though I suspect Neil Flynn, the janitor, had his voiced dubbed a la Natalie Wood in “West Side Story”).

The songs were co-written by the hilarious team of Robert Lopez and Jeff Marx, who created some great stuff in the irreverent Broadway musical “Avenue Q” and won a Tony for it. If you’ve seen the show or at least heard the music, the stuff on “Scrubs” will sound familiar. It’s no coincidence, then, that the lady who kept hearing the doctors singing was played by Stephanie D’Abruzzo, one of the original stars on “Avenue Q.”

Some of the songs sung Thursday were for comedy’s sake (Everything Comes Down to Poo, For the Last Time I’m Dominican) but others had some heart (Friends Forever/What’s Going to Happen).

For those who hate musicals but love the show and decided to stay away, I feel for you. For those who love musicals but hate the show, I feel even worse. The episode mocked all musical theater conventions, from the ensemble opening number to the riff on “Les Miserables” and “Grease,” this show did everything right. Maybe they’ll show it in reruns this summer. You can only hope.

“Scrubs” airs at 8 Thursdays on NBC.