You'd never guess by the melodic tones that emanate from the halls of the Sydney Opera House that its hidden weakness is none other than its acoustics. The discord began in 1967, when it was decided that the small sail portion of the structure, which was intended for stage productions, would house the opera, and the large sail, intended to house the opera, would serve as the concert hall. Not only did this leave the concert hall with an overabundance of seats, but it meant that the pit in the opera house was constrained to a tiny area that made it difficult for musicians to hear themselves and their fellow musicians. But sweeter sounds may lie ahead. Last year, plans were announced for a $202 million renovation, complete with acoustical upgrades, which could, at last, make the Sydney Opera House sound as good as it looks.