Emily Davies, 17, from the Forest of Dean, has been taught to play on the piano used by rock legends including Queen, Black Sabbath and Led Zep, who used it to rehearse their eighth and last album In Through The Out Door in 1978.
While she might be the envy of fans who attended the band's comeback gig on Monday, she said the piano was "not the best she had ever played on".
She said her piano was "hammered" when bands, which also included Deep Purple and Whitesnake, came to stay at the piano's former home at Clearwell Castle, Gloucestershire.
Her family said Freddie Mercury once had to pay for it to be repaired after playing it too roughly.
Now a wedding venue, the gothic castle was once a well-known rehearsal and recording studio.
Forest of Dean sculptor David Yeates, who lived in the castle as a youngster, rescued the piano when his grandparents sold it.
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