I am trying to remember a novel whose MC is reincarnated into a world of magic. Who became a pianist and a mage in a religious country that hunts down magicians. He made a name for himself as a musician but fled the country in order to pursue his thirst for magic.
That's Throne of Magical Arcana its on webnovel and its pretty good. My only issues was that there was a lot of block text in the later half. https://www.webnovel.com/book/throne-of-magical-arcana_6838665602002005 .But besides that everything else was amazing especially the scenes where he makes a new scientific discovery. However some people say it gives them a bad taste in their mouth because it reminds them of plagiarism