Below are three choices that allow you to play MIDI files in Final Fantasy XIV.
Bard Music Player is an automated music player for playing MIDI songs in FFXIV using the Bard's Performance mode.
This program allows you to automatically play pre-made MIDI songs for the in-game instrument performance feature in FFXIV. In addition, it provides many more useful features such as: playlist, searching, note preview, lyrics, piano input, chat logging, and orchestra mode (multi-performer).
This is a fun project to create a MIDI player for XIV. It's based on the published BMP2.0 libraries and made with the help of the Bards of Light community. This has a very similar feel to BMP so anyone looking to change should feel very comfortable here.
It's using two UI layouts, the old well known classic BMP and a WinAmp one. The WinAmp Ui is skinnable with the classic WinAmp skins.
An FFXIV Music Player widely used by solo bards to octet bands, featuring zero input latency and prefect sync between bards.
MidiBard 2 is an FFXIV music player for bards, based on the Dalamud plugin framework, which supports bard performance by MIDI files, FFXIV MIDI repository or keyboards.