Over their half-century tenure as one of pop’s most bountiful acts, the Bee Gees adapted their sound with the changing eras for consistently magical results. Timeless encapsulates as much of that as possible, starting with early chamber-pop tracks like “Massachusetts” before delving into the band’s falsetto-laden ’60s chart-toppers like “I’ve Gotta Get a Message to You.” Hearing these jangly numbers next to funky ’70s struts like “Jive Talkin’” only proves further how masterful these brothers truly were.