Nintendo was doing live concerts at the start and end of their respective Japanese Switch streams:
Nintendo Special Rock Band performance #1
Nintendo Special Rock Band performance #2
Nintendo Special Rock Band performance #3
Playlist (only the second Splatoon track changes between performances):
Splatoon (Splattack!, #1: Seaskape, #2: Friend List, #3: High Tide Era)
Xenoblade Chronicles (Mechanical Rhythm, You Will Know Our Names)
Mario Kart 8 (Big Blue / F-Zero, Excitebike Arena, DS Wario Stadium, Bowser’s Castle, Electrodrome)
Splatoon 2 (Ink-oming, by Wet Floor, the game’s main theme)
Nintendo Special Rock Band
Arrange: OOYAMA Tetsuya
Drums: KADO Shuntarou
Bass: TABOKUN
Guitar: Koei”CO-K”Takafumi, AYUMU
Keyboard: ODA Tomomi
Nintendo Special Big Band performance
Playlist:
Donkey Kong medley
Kirby medley
Animal Crossing medley
The Legend of Zelda medley
Pokémon medley
Fire Emblem medley
Super Mario medley
Nintendo Special Big Band
Bass & Keyboard: SASAJI Masanori
Bass: KAWASAKI Teppei
Drums: OOTSUKI “Kalta” Hidenori
Guitar: HIJIKATA Takayuki
Percussion: Carlos KANNO
Trumpet: Eric MIYASHIRO, NISHIMURA Kouji, OKUMURA Akira, NIIDA Hitomi
Trombone: NAKAGAWA Eijirou, MURATA Youichi, HANDA Nobuhide
Bass Trombone: NONOSHITA Kouichi
Alto Sax: KONDOU Kazuhiko, TERACHI Miho
Tenor Sax: IHARA Ryouji, TAKENO Masakuni
Baritone Sax: YAMAMOTO Takuo