http://astropost.blogspot.com/2010/10/mariah-carey-1145-am.html about Mariah Carey's chart today and about the relationship between her chart and that of her first husband.
See http://art-astrology.blogspot.com/2009/07/chart-of-mariah-carey.html on this blog for the earlier post about the talent in the chart of Mariah Carey.
The artistic pattern is constructed by Moon conjunct Neptune in the fifth house, by the passionate mutual reception of Venus and Mars (the rulers of the Midheaven routing), starting with the MC in Pisces. Neptune is 157.5 degrees from ASC/MC and Mercury (for writing or singing) 67.5 degrees from Sun/Moon. The Moon is in the fifth house of performance and show, conjunct Neptune (the planet of arts).