Living well is not the best revenge; success is.

In a time when the "sensitive singer-songwriter" is virtually doomed to club-circuit oblivion, Dan Fogelberg has suddenly amassed an adoring audience doing exactly what he's been doing for 10 years, and doing well.

Granted last year's surprise album hit, "Twin Songs of Different Mothers" with Tim Weisberg, helped spread his name around; but the single which propelled album sales, "Power of Gold," was vintage Fogelberg.

Last night, in a sold-out concert at the Kennedy Center, Fogelberg went boldly where few musicians have gone before: He played the entire show solo, no opening act, no back-up, no intermission. Armed only with a piano, a half-dozen guitars and material from as many albums (counting a forthcoming one), he mesmerized his audience for nearly two hours. The tentativeness which once haunted his voice has been banished, and his playing has new assurance as well.

What sets Fogelberg apart from the songwriter throng is the ability to sey down seemingly simple lines, then twist them with an u n e x p e c t e d rhyme: "Here is a key to a house far away/Where I lived when I was a child/They tore down the house when I moved away/And left the key unreconciled."