You don't say, Just Fine (Solo fino) in Spanish to mean "Just Fine." To say 'solo fino' (the literal translation) in Spanish means you don't want the coarser ones, just the fine ones. Instead, you say "very well" which translates, "Muy bien."
It means, in Spanish, single accomodation. I have generally seen it used when there is a choice between whether or not you want breakfast included in your stay (e.g. solo alojamiento or alojamiento y desayuno).
Well, concerto means concert in spanish, and solo means by your self, and sympohny means An orchestral interlude in a large-scale vocal work, and A medium-length narrative or descriptive piece of music with vocal solos and usually a chorus and orchestra.