Piano Man is the second extended play by South Korean girl group Mamamoo.

[13] "Gentleman" is also retro-inspired with brass instrumentation, and is about a group of female friends meeting at a café to discuss their ideal men.

[16] It takes place in a jazz bar and features B1A4's Gongchan, wearing a trench coat and fedora, as the "piano man".

[16] The Mamamoo members play a singer, bartender, businesswoman, and dancer who are all trying to seduce the pianist.

The song was first performed on SBS MTV's The Show on November 18, three days before the album's release date.