Since we are on the subject... I wonder, what if one encoutered a collector who had a sole surviving copy of a performance by a major performing organization, say the Boston Symphony. While a case could be made for the "priceless" nature of it, the person does not own the rights to the performance recording, hence there would be no value they could deduct. Then the question of what the market value might be, assuming one were to obtain the rights to the recording. The cost of the rights would outweigh the potential return for any sales...unless the particular performance was of such great interest one could expect sales of over 50,000...not likely. It would seem to me that in this scenario, when it came to the notion of fair market value, it would be zero. I am reminded of some years ago when the Toscanini materials were donated to New York Pubic. As I recall the appraisal was $1M. I wondered, what was the basis for that valuation. The family owned the rights only to the extent of the conductor's contribution, yet the orchestras had rights as well. Comments are most welcome. Karl