The Bard is one of numerous Jobs granted by the Water Crystal. Final Fantasy III is the first game in the series to feature the Bard job. Bards would go on to make on and off appearances, most infamous via Edward in the Final Fantasy IV
Bards are a quirky job. Much like Scholars, they has a unique weapon type: Harps. Harps are used to play music at the enemy, meaning that they technically count as ranged weapons. The job's abilities are significantly different between versions: In the Famicom version, Bards manipulate ally and enemy stats with the "Cheer" and "Scare" commands, respectively. In the 3D remake and the Pixel Remaster, their signature ability "Sing" appears instead.
Sing is the Bard's signature ability in the remake. When using it, the bard sings a song using their harp. The effects of the song depend on the harp used.
Sing becomes one of the quirkiest abilities in the game while still being useful. The songs that the bard sings vary depending on the harp that they are holding. This means that you are locked out of using certain songs until the end of the game as well as the bard getting the most use out of the "equipment" menu option, which allows the character to swap out their weapons mid-battle.