Conversation so far:
What is the Timbiriche Era and its relationship with Thalía?
Thalía obtained the protagonist role of Sandy Dee in a musical, and she performed in 500 theater presentations of Vaselina along with Timbiriche.
Is Timbiriche Thalia's first band?
In 1981, Thalía's first group she was a part of was as a vocalist in a children's group named Pac Man.

Question: How long was Thalia with Pac Man?
Self-contained rewrite: How long was Thalia with Pac Man?