This is a trick question in Dutch!
The sentence “Een lied dat ‘s in een boom klinkt” literally translates to “A song that ‘s sounds in a tree.” However, the apostrophe “‘s” is a clue that it’s not meant to be taken literally.
This phrase is actually a cryptogram, a type of puzzle where letters are substituted with other letters. In this case, the apostrophe “‘s” is likely a replacement for a single missing letter.
Unfortunately, I can’t solve the cryptogram for you without more information about the specific rules or context of the puzzle.