Walter Parazaider, Lee Loughnane, James Pankow, photographed by Brian Finke in Wantagh, N.Y., Jones Beach Theater, June 22, 2007
Top songs: "If You Leave Me Now," "Hard to Say I'm Sorry," "Look Away," "25 or 6 to 4," "You're the Inspiration"
Listen to: "25 or 6 to 4""Hard to Say I'm Sorry"Essential albums: Chicago Transit Authority, Chicago X, Chicago 17
Why they rock: This ballad machine has squeezed out a Top 40 single almost every year of their four-decade career.
Bottom line: The 2007 tour will gross more than $12 million.
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