On the back patio of a Greek restaurant, a white-haired man making his way to the exit paused for a second look at one of his fellow diners, a man with a prominent nose who wore his dark hair in a modest pompadour.

“You look a lot like Steve Perry,” the white-haired man said.

“I used to be Steve Perry,” Steve Perry said.

This is how it goes when you are Steve Perry. Everyone is excited to see you, and no one can quite believe it. Everyone wants to know where you’ve been.

In 1977, an ambitious but middlingly successful San Francisco jazz-rock band called Journey went looking for a new lead singer and found Mr. Perry, then a 28-year-old veteran of many unsigned bands. Mr. Perry and the band’s lead guitarist and co-founder, Neal Schon, began writing concise, uplifting hard rock songs that showcased Mr. Perry’s clean, powerful alto, as operatic an instrument as pop has ever seen. This new incarnation of Journey produced a string of hit singles, released eight multiplatinum albums and toured relentlessly — so relentlessly that in 1987, a road-worn Mr. Perry took a hiatus, effectively dissolving the band he’d helped make famous.

He did not disappear completely — there was a solo album in 1994, followed in 1996 by a Journey reunion album, “Trial by Fire.” But it wasn’t long before Mr. Perry walked away again, from Journey and from the spotlight. With his forthcoming album, “Traces,” due in early October, he’s breaking 20 years of radio silence.

Over the course of a long midafternoon lunch — well-done souvlaki, hold all the starches — Mr. Perry, now 69, explained why he left, and why he’s returned. He spoke of loving, and losing and opening himself to being loved again, including by people he’s never met, who know him only as a voice from the Top 40 past.

And when he detailed the personal tragedy that moved him to make music again, he talked about it in language as earnest and emotional as any Journey song: