pseudonym58 I suppose it's actually a joke at alto singers' expense. I'm not familiar with the stereotype, but does it imply that they have a limited range? (EDIT: See correction by MRC, below)
TLH21 pseudonym58 Nailed it! Case in point https://youtu.be/C736DC9lHn8?feature=shared Altos are bottom right, and not that this piece in itself is boring.
MRC The clichรฉ is not that the alto singers have a narrow range, it's that the parts they have to sing are extremely boring. See for instance: https://www.instagram.com/p/CJEezTHJa43/?igsh=ZXNqZTk2eGJsNGZ3 The very narrow piano is a sculpture by Bjorn Perborg. It doesn't play.