"unprecedented voice" is correct and usable in written English.
You can use it when describing something that is unique and not seen before. For example, "Her unprecedented voice carried through the room with an unexpected power."
Fortunately, during last-minute negotiations, in August, Gelb veered away from disaster, winning some concessions from the unions but also giving them an unprecedented voice in the supervision of the Met's finances.
And Latinos won an unprecedented voice in the Republican Party with the election of more Latino Republicans than ever before -- sometimes without the support of Latino voters, who tend to put issues before ethnicity.
With an unprecedented voice large enough to fill an opera house, Jesus, a petite 22-year-old from Madison, Wis., has proven to be anything but run-of-the-mill Midwestern.
Although the Arab Spring has not yielded the democratic results that many hoped for, the role of digital media tools in giving an unprecedented voice to young people across the Middle East was undeniable.
He seems unmoved by an unprecedented ministerial communiqué, voicing fears about the bank's credibility and the motivation of its staff.In this section Will there be life after Wolfowitz?
Pakistanis have voiced unprecedented anger against the Pakistani Taliban, calling for the peaceful majority to reclaim the country's destiny from gun-toting, head-chopping extremists.In this section Unsettled for a long time yet A Dalai Lama dilemma A game of chicken No help, please, we're Buddhists Dancing off the stage?
This can influence staff practices and give older LGBT people an unprecedented, supportive platform to voice concerns.
Kids today also have unprecedented options to publically voice their displeasure.
With an unprecedented cacophony of media voices and a greater range of political parties assumed to be credible and big hitting than ever, it's got to happen.
In today's knowledge sharing economy, customers are more informed about their and are more willing to use their voices with unprecedented scale and amplification.
This effort, predicated on a genuinely intimidating mountain of evidence, and an unprecedented coalition of influential voices spanning the globe, is all about turning what experts know about healthy living into what everyone knows, and actually uses.
