How should I say: When we talk, it sounds like we are singing


Because I am half-Swedish, I usually joke about this to other people. But now,
I don't really know how to say it in Japanese!

Maybe...

> 話すのとき、歌のように聞こえる。。。




It would LITERALLY translate to  

> (私たちが)話すとき/話すと、歌っているように(orみたいに)聞こえる(or聞こえます)。  
>  When we talk, it sounds like we are singing.

But to sound more natural I think you can say

> スウェーデン語で話すと、歌ってるみたいに聞こえるよ/聞こえますよ。  
>  (Lit. When I speak Swedish, I sound like singing)  
>  スウェーデン語って、歌ってるみたいに聞こえるんだよ/聞こえるんですよ。  
>  (Lit. Swedish language sounds like you're singing)  
>  スウェーデン語って、歌みたいだよ/ですよ。/ 歌みたいに聞こえるよ/聞こえますよ。  
>  (Lit. Swedish language is like a song / sounds like a song)  
>  etc...

