Lachey loves a cappella music and says his summer gig in high school was singing second tenor in a traditional barbershop quartet top hats and all.
Through performing arts school, he also joined a six-part male harmony group.
But his favorite a cappella gig was with 98 Degrees, when the boy band sang Ave Maria at the White House for President Bush.
Lachey says a cappella is a different rush than recording with backing tracks because its so raw, you cant fake the funk.
He adds, Theres nothing to hide behind you have to be good.
He recommends tons of practice, warm-ups, tea, and honey to get pipes into their prime.
Lachey is hosting The Sing-Off, a four-night battle between a cappella groups from across America, premiering December 14 on NBC.
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