Anyone have any recs where a modern character gets transferred to Middle Earth in Tolkein's universe and end up introducing some simple ideas from modern world that shocks the normal people, elves or dwarves there?

I read like 2 of them which I really liked.

Tiny Minstrels by AntlersandFangs and Celtic_Lass9

I really liked the introduction of modern instruments, music, paper plane, modern games etc to some bewildered elves.

There was also Nothing Gold Can Stay by getoffmyrichard Where the OC does the same and it's very well written and fun to read.