I just finished reading another excellent mystery by Louise Penny: The Beautiful Mystery. Penny's series of Inspector Gamache mysteries, which take place in Québec, gets better and better with each volume. I'm always looking forward to the next one. 

This time I read a library book. To my surprise, a previous reader wrote in the book, something I rarely see in books from the library. The individual wrote timbre over this bit of dialogue:

"Well, I have an unusual singing voice. A strange timber." 

Would you have caught the error–and annotated it? I was glad the previous reader had. It helped me recognize the correct spelling of timbre. 

Definition of timbre: the combination of qualities of a sound that distinguishes it from other sounds of the same pitch and volume.

Definition of the more familiar timber: trees or wooded land considered as a source of wood. Wood used as a building material; lumber. 

I was glad to relearn this correct spelling. And to find out at the end of the book who had killed the prior!