Conversation so far:
Whose independent career was this?
In the early to mid-1990s, Isaac, Taylor and Zac sang a cappella and recorded such classic songs as "Rockin' Robin", "Splish Splash" and "Johnny B.
Goode".

Question: Which other songs did they record?
Self-contained rewrite: Which other songs did Hanson record besides "Rockin' Robin", "Splish Splash" and "Johnny B. Goode"?