"Wynton and Christopher were really great experiences for me because they are both very gifted artists"

Kathleen Battle is referring to her experiences dealing with two very skilled artists, Wynton Marsalis and Christopher Parkening. She is expressing her adoration for their musical gifts and the impact they had on her. She likely had the chance to collaborate with them and gain from their expertise. She is likely referring to the creative process of working with them, the motivation they provided, and the knowledge they shared. She is revealing her gratitude for the chance to work with them and the impact they had on her. She is likely describing the growth she experienced as an artist and the lessons she learned from them. She is expressing her appreciation for their skill and the effect they had on her.