Yes, those are the co-ed schools in Bristol. They all take children from 4-18. There is also QEH just for boys, and Red Maids, Redland High and Badminton for girls.
Of the schools you mention, Clifton College is probably the most musical - very good facilities, lots of musical events, offers music scholarships. It is also very strong in sport, but I don't think you have to be sporty, iyswim. It's the only traditional 'public school' in Bristol, unlike the others which are all (except Badminton) day schools and most of which used to be grammar/direct-grant and so less socially exclusive.
Clifton's academic reputation has slid quite a bit in the past decade or so, and it is much less selective than it used to be (I've known several children accepted there who have been rejected by QEH, BGS and even Clifton High). I've also heard some complaints that it relies too heavily on overseas boarders (with limited English and a tendency to stick to their own groups) to prop up finances and academic results in the senior school, but I don't know if that is more true of Clifton than many other boarding schools these days. It is also expensive: fees for day pupils are about 40-50 per cent higher than for the other day schools in Bristol.
Bristol Grammar would probably be the most academic of that list, though not an academic hot-house. Also does lots of music and sport, but doesn't have the facilities for either that Clifton College does. I think BGS is the only one where you might have trouble getting a place in some of the junior classes at the moment.
Colston's has always had a reputation for being very sporty and not very academic. I don't know anyone with children there at the moment, so can't vouch for that, but certainly if you look at exam results tables, it lags well behind BGS/QEH etc. Don't know much about their music.
Clifton High turned fully co-ed two or three years ago, but boys are still very much in the minority. Its reputation is mainly as a nice, smallish, friendly school with respectable but not outstanding academic results. Quite arty, reasonably musical, moderately sporty (but not great for boys' sports because of small numbers).