An Ultrastar port should be interesting for add in retropie, with usb mic support in order you can do a portable karaoke for eady play in any TV or bars, pubs, etc :
USDX/config.ini at master · UltraStar-Deluxe/USDX · GitHub
No Microphone Settings on Mac OS X Mojave (10.14) · Issue #389 · UltraStar-Deluxe/USDX · GitHub
UltraStar: Setting up the Microphones | The Bricky Blog
Feel the need for a little karaoke? Check out UltraStar Play and UltraStar Deluxe | GamingOnLinux
Rewelacyjny zestaw do karaoke 4 x mikrofon DM-202 - Sklep, Opinie, Cena w Allegro.pl
Rewelacyjny zestaw do karaoke 4 x mikrofon DM-202 - Sklep, Opinie, Cena w Allegro.pl
Ultrastar Deluxe - Download
Androidove aplikacije programera UltraStar Play na usluzi Google Play
Rewelacyjny zestaw do karaoke 4 x mikrofon DM-202 - Sklep, Opinie, Cena w Allegro.pl
My Little Karaoke - Ultra-Quick setup guide
Amazon.com: Pair Of SingStar Wired Microphones (PS2/PS3) : Video Games
Ultrastar Deluxe - Download
My Little Karaoke - Ultra-Quick setup guide
UltraStar Deluxe 2017.8.0 Download
Best FREE singing party game! Custom songs and microphone app. Enjoy UltraStar Play on PC and mobile - YouTube
My Little Karaoke - Ultra-Quick setup guide
UltraStar: Setting up the Microphones | The Bricky Blog
UltraStar Karaoke · GitHub
My Little Karaoke - Ultra-Quick setup guide
UltraStar: Setting up the Microphones | The Bricky Blog
Karaoke Revolution - Gamereactor UK
UltraStar Play Companion – Alkalmazások a Google Playen