Nomaestro, along with the rest of its evolutionary line, is a reference to the character Nonon Jakuzure from the anime Kill la Kill. Nonon's Uniform (Symphony Regelia) transforms into a giant sound system that produces powerful soundwaves and can transform into a flying airship, and later on, into a jetpack (Symphony Regalia MK I). Nonon is a female, hence why its description is about eardrums shattering (and saying the songs are beautiful) and why it's a flying type! This is the first Kill La Kill reference, along with Araketsu and its evolutionary line.
Remember NANISORE? Yeah, it became a meme. So that's probably why Nomaestro was made along with its evolutions. "What does that mean?" became an iconic line for Nonon, soon, it became a meme, and tada. It became a MEMEorable phase. You really don't need to ask. Nanisore!