Well I'm Lithuanian and as I know once our language have made it to the top 5 of the most beautiful languages of the world 🙂 I think it's a nice language, but I guess it would be hard to learn it for people from other countiries.
I can speak Lithuanian (Laba diena! ;] ), english( I love this language ), russian(I think it's easy to learn, at least for me :]). I want to learn Spanish and German, but I have no idea from what should I start it ;DDd
French, Spanish, japanese and english(with an accent) are my favourites 🙂
To me, Sindarin is the most beautiful to the ear but obviously that doesn't count if we're talking about living languages 😛 I love the sound of Swedish, it's so soft and it has that certain singing quality to it. Norwegian sounds comical so I like it in that way.
I must say that I like English very much too (I'm not a native speaker): I'm attracted to the wide variety of dialects and the descriptiveness of it. There are so many adjectives in English and certain things I could not imagine describing in any other language simply because I would be lacking the words to do so.