In the field of phonaesthetics (the beauty of sound), the phrase 'cellar door' is often used as an example of 'euphony' (a beautiful sound, separate from meaning). I would love to learn some words or phrases in your language(s) which you find to be particularly euphonic.
A few of my favorites are:
crepúsculo (twilight, in Spanish)
canções (songs, in Portuguese)
benadoora (tomato, in Arabic)
citlali (star, in Nahuatl)
spoko (cool, in Polish)
<em>carcinoma</em>
<em>algorithm</em>
<em>prairie</em>
<em>sentimental</em>
<em>nevermore</em>
<em>sesquicentennial</em>
<em>Aldebaran</em>
<em>
</em>
I think many city and state names in the United States are nice:
<em>Kalamazoo</em>
<em>California</em>
<em>San Francisco</em>
<em>Winnipesaukee</em>
<em>Lake Mooselookmeguntic</em>
<em>
</em>