There are singers and actors that we always seem to associate with each other. One duo is John Travolta and Olivia Newton-John. They’ve teamed up this year for a Christmas album, “This Christmas.” It’s got the usual standards, but this album’s hook is the collaborations. No less than Barbra Streisand, Tony Bennett and James Taylor, among others, contribute lead vocals to various songs. Although, the best collaboration is John and Olivia singing “Winter Wonderland” with the Count Basie Orchestra. You’ll find yourself listening to the arrangement, when it hits you that John Travolta is carrying the tune quite well. John and Olivia trade-off lead vocals on many songs. They’ve chosen wisely.