This growth is due to rising car sales and ample credit as banks, finance companies and car makers' financing arms compete to lend to consumers, either directly or via car dealers.
Either a low urgency like a Facebook notification, a medium range urgency like a check engine, and finally, a high level urgency, like an incoming collision warning.
Both can utilise the unique human vocal tract.Both have a kind of beat. Both can express emotion. Both can be either carefully composed or spontaneously improvised. And both are highly social.