Tanya is a singer in Deadman's Port. Her performances were the favorite of Edward Baines.
After Jim Raynor and Tychus Findlay left Deadman's Port, Baines went to see Tanya perform to celebrate. However, Raynor and Findlay had paid the establishment she sung at to instead show a entertainer named Kyttyn, who game a profane performance with the intent of embarrassing Baines.
References
Golden, Christie (April 12, 2011). StarCraft II: Devils' Due. Simon & Schuster (Gallery Books). ISBN 978-1416-55085-3.