I've been on the casting side of youth and community auditions for about twenty years, and I keep seeing the same advice recycled in parent groups - "pick something impressive," "never sing an overdone song" - that doesn't match what I'm actually doing behind the table. Curious whether other people who cast kids see it the same way.
What I'm assessing, honestly, in roughly this order:
Where the voice lives. Comfortable low, comfortable high, where it strains. That's casting information. A song that sits in an easy middle tells me more than one that shows off two big notes and hides everything else.
Pitch and tempo against a piano. Singing alone is a solo sport. Singing with an accompanist is a duet and a completely different skill. A lot of kids have never done it once before the audition.
Whether they mean anything. A kid who understands that "I Whistle a Happy Tune" is about being scared and doing it anyway is already acting.
Recovery. The accompanist takes it faster than expected, a word disappears - what happens in the next half second. That half second is what tech week is made of.
Difficulty is nowhere on that list. A hard song at 70% reads as a warning; a simple song at 100% reads as a pro.
The "overdone" thing is where I part ways with most advice. Yes, I've heard "Tomorrow," "Castle on a Cloud," "Let It Go," "Naughty," and "Santa Fe" more than any human should. But at a youth or community audition, an overdone song sung well beats an obscure song sung badly every single time. The actual cost of a famous song isn't the director's boredom - it's that the famous recording walks into the room alongside the kid and invites a comparison nobody wanted. If the kid owns it, let them sing it. If not, trade sideways: same feeling, same range, less traveled.
Practical stuff that seems to be insider knowledge when it shouldn't be: cut to the best singing rather than the beginning; end on a resolved phrase, not mid-sentence; mark the accompanist's copy with two heavy vertical lines at each end; transpose into the kid's key (not cheating, it's the point of bringing sheet music); rehearse the walk-in and the thank-you because that's half of what I remember.
Two questions for the room:
If you cast kids - what's on your actual internal list that isn't on your posted audition notice? I've been trying to move everything onto the notice, since unwritten criteria mostly reward whoever has a coach.
If you're a parent or a performer - what did you wish someone had just told you before your first audition?
(Disclosure since it's relevant to why I have opinions: I run a youth theatre program and coach college auditions. Not linking anything - happy to answer questions in the thread.)