The official Japanese Pokémon YouTube channel will broadcast an Official Pokémon Brilliant Diamond/Shining Pearl Release Commemorative BGM Orchestra (『ポケットモンスター ブリリアントダイヤモンド・シャイニングパール』発売記念 BGMオーケストラ) concert at 09:00 UTC. To celebrate the release of Pokémon Brilliant Diamond and Shining Pearl, they'll be performing orchestral arrangements of BGM from Pokémon Diamond and Pearl!

Enjoy a special performance of the song Battle! Champion (戦闘！チャンピオン) that won first place on Twitter in the #DipaBGMChampionship (#ダイパBGM選手権) hashtag popularity contest.

YouTube Clip - Official Pokémon Brilliant Diamond/Shining Pearl Release Commemorative BGM Orchestra

Source: https://www.youtube.com/watch?v=A6Gbuh05OTs