Eternal Cadence

 is an American adventure-fantasy rhythmic RPG video game series created by TBD, being developed by Hard Hat Software and published by Microsoft since November 15th, 2001.

Synopsis
The series follows mystical worlds with their worlds and characters all built around music in some shape or form.

Eternal Cadence
Set in the realm of Harmonia, two kingdoms Evergard and Nihilum have been in war for six magical artifacts known as the Instruments as a young farmer gets thrust into the war when both he finds one of these Instruments and when his sister gets kidnapped by the Nihilum.

Games

 * 1) Eternal Cadence (2001)

Introduced in Eternal Cadence

 * Arnold "Andy" Hemmers (voiced by TBD) - a calm and adventurous young adult man who was a farmer before finding one of the magical instruments known as the Crimson Guitar as he decides to use them to save his sister from the Nihilum while also aiming to stop them before they get all six Instruments.
 * Tornado (voiced by TBD) - a noble griffin who serves as Andy's mount and sidekick, being the first friend he encounters on his quest to stop the Nihilum.
 * [female young adult, obviously not to be Andy's love interest, magic user or archer]

Introduced in Eternal Cadence

 * Musa (voiced by TBD) - an enthusiastic, music-loving blue fairy who befriends Andy, helping him on his quest by helping point him in the direction to go, surprisingly being in every major town he visits.

Introduced in Eternal Cadence

 * TBD
 * Celestia Hemmers/The Black Melody (voiced by TBD) - Andy's younger sister who was captured and brainwashed by the Nihilum, having dark energy pumped into her veins as she becomes their top sorceress, helping them find the Instruments.

Recurring

 * Trebbles - mischievous four legged music-note like creatures who love to cause chaos and mischief, often being easily defeated.

Gameplay
The games play as a turn-based RPG as you explore through the region, battling against enemies. The combat is rhythm based as every attack requires you to press buttons at the correct rhythm or else the attacks will cause less damage. Special attacks require MP (music points) and more fast and difficult button presses yet causes way more damage. The combat also allows you to block attacks by timing button pressed to mitigate damage. The games have a leveling system as after leveling up your characters gain more health and attack points. The games also have shops where you can buy items to heal and boost stats.