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New pictures released by ITV show a first look at A1 and Eternal in the second episode of The Big Reunion.
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Training their relaxed vocal chords with veteran vocal coach Yvie Burnett before taking on choreography and spacing, the two reformed bands seem to be taking things very seriously in the lead-up to their live shows.
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After four fans were crushed to death A1 decided it was time to split, but are now taking on their demons and breathing new life into their career.
Eternal were plagued with rumours of their constant fighting, and after Louise Redknapp and Kelle Bryan quit the band, sisters Easther and Vernie called it a day 14 years ago.
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The Big Reunion continues on ITV2.