Musical Sergal Common

Verdonese scholars created Musical Sergal Common (MSC) as a way to study the Sergal Common language. It condenses the high-pitched and low-pitched tones of Sergal speech into the highest and lowest notes of three octaves, a tonal range sufficient to capture most of the variation of interest to Verdonese  researchers. Due to the inability of humans' tongues and vocal chords to make the necessary and precise trills, some common human tongue and lip sounds have been introduced that do not exist in any Sergal language, and the overall speed of the language has been slowed down significantly (average of 1.5 phonemes per second rather than the overall Sergal average of 4.5). Musical Sergal Common is mostly an academic tool, although it is sometimes used to send coded messages.
Sergals absolutely detest Musical Sergal Common, stating that it is demeaning to their language and completely unnecessary as they are perfectly able to speak any other humanoid language. Speaking in MSC is a great way to upset educated Sergals. It is also a good way to confuse Sergals who are intelligent yet unaware of its existence, as they are able to intuitively recognize it as a slowed-down and simplified version of their language but unable to derive any meaning from it without serious thought. This works much like the way recordings of distorted or reversed speech tends to unsettle humans and led to moral panics in the 1960s and 1980s AD.
Ironically, Sergal sages did assist in the creation of Musical Sergal Common (in fact, it obviously would not have been possible without their help). If any of them lived to regret it, however, none of them ever said or wrote as much.