Me too. Äro is not a real word. Is the o added just to balance the syllables to the music?
It's a form that was used historically, we used to have plural forms of the verbs so they would say jag/du/hon är but vi/ni/de äro back in the days. But it's gone totally out of use.
Thank you very much for this information. I appreciate learning about the history of Swedish.
Yes, and there's even a third word, altviolin. I believe viola is the most common one, but I could be wrong. There's nothing wrong with either of them.
Hm, which "viol" are you thinking of? The musical instrument is called gamba or viola da gamba in Swedish.
Yes! Well spotted. Etymologists think it's probably derived ultimately from Latin vitula, which means "string" if I remember correctly.
Swedish actually used to have the very direct cognate fidla for a fiddle as well. It then turned into the word fela, which you may come across in modern Swedish, if very rarely.
My Swedish grandfather played the "fiddle" (actually a violin) for folk dancing in Lake Norden South Dakota. Thanks for this etymology!