Highlights from this week's program include: a conversation with tenor Carl Tanner. His latest CD is a celebration of great Christmas hymns and carols. Meridee Duddleston looks at how art is more and more being collected as an investment rather than for its esthetic value. Susan Lewis goes beyond the Gross Clinic controversy to profile the artist Thomas Eakins and explores his multifaceted legacy to Philadelphia. Jason Peifer looks at the growing popularity of children's theater and speaks with the creators and producers of several family-oriented productions in Philadelphia.