Make it easy to learn. I can understand almost all of them, but other people have trouble with it. A creole based on French, and edited by Portuguese, with roughly 50,000 speakers. However, Baritone is more common. There is also the Tenor, and because that Tenors are so scarce, they generally get paid more in choirs.
Adult females have different types of singing voices.
Soprano, Contralto, and Mezzo-Soprano are the most common. Kids have voices that are from Soprano to Contralto. Pig Latin and other ciphered languages. That's because Pig Latin is very simple. I know Pig Latin well enough to be understood when I speak it.