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The saving roll - can you make that at the beginning of the song and keep it for the duration or do you have to save at the time of attack and roll again for each new attack?
If you can make it at the beginning and keep it. If you don't like it, next turn can you stop/start the song at roll again for a save you like?
The bard makes a new Perform check each round of the countersong.
If someone happens to need to save against a suitable attack that round, that person rolls a normal save, but can choose to use the bard's Perform result in place of their own save.
Countersong can also grant a second save for people already influenced by a suitable effect at the time the bard begins the countersong, but for this use the bard's Perform check must be used in place of the person's regular save.
Quoted for reference:
Countersong (Su): At 1st level, a bard learns to counter magic effects that depend on sound (but not spells that have verbal components). Each round of the countersong he makes a Perform (keyboard, percussion, wind, string, or sing) skill check. Any creature within 30 feet of the bard (including the bard himself) that is affected by a sonic or language-dependent magical attack may use the bard's Perform check result in place of its saving throw if, after the saving throw is rolled, the Perform check result proves to be higher. If a creature within range of the countersong is already under the effect of a noninstantaneous sonic or language-dependent magical attack, it gains another saving throw against the effect each round it hears the countersong, but it must use the bard's Perform skill check result for the save. Countersong does not work on effects that don't allow saves. Countersong relies on audible components.