Well, my sample is not that big:
I was born in Argentina, where we speak Spanish with an Italian accent (we really do, watch an Argentinean movie and, unless you know Italian or Spanish, you'll think you're watching an Italian movie).
For most of my childhood, Hebrew was my native tongue (even though I don't remember much and it sounds foreign to me now). You are also exposed to the sounds of the Arab languages in Israel a little.
I moved here to Canada in 2000 so now speak english -- this should be obvious

. And I started trying to learn mandarin chinese a couple of days ago (so far I only know "hello" "how are you" etc. , but I'm familiar with the sounds of the language at least)
To me, definitely English. English is really a mixture of many languages. It took bits and pieces of many languages, so it has a very open grammatical structure (many other languages have very strict sentence structures -- I'm not sure if there is another language quite as open an English). This is why English poetry and literature is so beautiful and different, I think -- it's such a free language, that those who master it can paint beautiful and unique images with the bonus of having lots of "free room" to play with (I don't think Finnegan's Wake could have been written without an English sub-structure).
It also sounds very "liquid." all the words flow easily in and out.
compare it to middle-eastern languages such as Hebrew and Arab -- full of horrid-sounding, tough sounds: "I love you" in Hebrew is "Ah-nee Oh-ev OTAGH" -- the vowels are harsh and throaty, and the best way I can describe the "GH" sound is the sound you make before you hork up phlegm... thankfully not used in the English language.
There is a reason why people from all over the world are drawn to the sound of English singing; the language just flows (Americanization might also play a part, but this was true before Americanization). English sounds "cool," but is also very beautiful and song-like.