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Writer and humorist Garrison Keillor served up a bittersweet farewell for some 18,000 fans at the Hollywood Bowl, as he hosted his final episode of the old-style radio variety show, "A Prairie Home Companion."

Keillor's swan song Friday night wasn't markedly different from most of his nearly 42 years of "Companion" episodes, offering a rich mix of Americana music and often tongue-in-cheek comedy. (Although U.S. President Barack Obama did call in for a special segment recorded earlier Friday, but not even the Bowl audience will hear that until Saturday's broadcast.)

The Los Angeles Times reported that聽Keillor began writing Friday鈥檚 show on the flight Wednesday from Minnesota to Los Angeles; he finished penning the sketches over coffee and oatmeal in his hotel room Thursday morning, and the monologue yet to be written as of rehearsal time and the fate of certain characters still hanging in the balance.

Friday night's "last-show" aspect of the doings was so subtle that, at one point, even Keillor's cast mates began to prod their boss, asking, "How do you feel (about leaving)?" Keillor eventually, reluctantly replied, "It feels like something ends and something else is about to happen."

The 73-year-old Keillor delivered one last "Lives of the Cowboys" comedy sketch as well as the show's best-known segment, "News from Lake Wobegon," a folksy report from a fictional town where "all the women are strong, all the men are good looking, and all the children are above average"

Keillor sang a few more songs and closed out the show as if it was any other.

Only during the encore did he truly take time to say goodbye, engaging the crowd with a moving medley of songs running the gamut from classic spirituals to pop ballads.

"Companion" attracts more than three million public-radio listeners in the U.S.; many more counting the show's Armed Forces Radio audiences worldwide.

After Saturday's season finale, it will return with new episodes in October with an updated format and new host, Chris Thile, a singer and mandolin player, who has served as a guest host on 鈥淧rairie鈥� before.聽

鈥淐hris Thile聽is a gifted artist and a great musical enthusiast of far-ranging interests,鈥� Keillor previously聽said聽of Thile when the singer briefly took on the guest-host job. 鈥淗e is a great choice.鈥澛�

Next, Keillor plans to do concerts and is working on a "Wobegon" screenplay. Last year, when he announced his exit from the show, Keillor said:聽

鈥淚 have a lot of other things that I want to do,鈥� he聽said. 鈥淚 mean, nobody retires anymore. Writers never retire. But this is my last season. This tour this summer is the farewell tour.鈥�