As this well-selected “best of” package makes clear, Chicago quickly found that tuneful midtempo numbers and romantic balladry were their true forte. In early hits like “Color My World,” “Does Anybody Really Know What Time It Is?,” and “Saturday in the Park,” the band emphasizes smooth, plaintive vocals and tight, lustrous arrangements. Tunes like “Wishing You Were Here,” “If You Leave Me Now” and “Old Days” continue in a soft yet distinctive vein, boasting seamless ensemble work along with inescapable hooks. Weathering the loss of lead singer Peter Cetera in 1985, the band remains faithful to their core sound on such melodically-rich singles as “Look Away” and “What Kind of Man Would I Be?”