[girzel]

I've heard Chinese people learning Scandinavian languages complain that they're too damn "tonal": they found the sing-songy nature of those languages (at the sentence level, not the word/character) to be very bizarre.

[schoen]

Somewhat unusually for Indo-European, Swedish is literally a tonal language:

https://en.wikipedia.org/wiki/Swedish_phonology#Stress_and_p...

(that is, there are word pairs that are distinguished only by tone)

[iamshs]

Punjabi is also classified as Indo-European language and it is also a very strong tonal language. The topic is also a subject of research as none of surrounding languages have such tonal variations.

[_emacsomancer_]

There's a correlation between (loss of) aspiration and tones in Punjabi.