It's Necrofantasia from Touhou on Trombone.

Necrofantasia Trombone Solo

Mokou's theme from Touhou - Reach For The Moon Immortal Smoke - Played on an Acoustic Grand Piano.

Reach For The Moon Immortal Smoke - Acoustic Grand Piano

Sakuya's theme - Flowering Night - Remixed and played on an Acoustic Grand Piano.

It's Hong Meiling's theme from Touhou EoSD played by 4 Acoustic Grand Pianos.

Really good mashup between Harebare Fanfare and All Star.