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".
Which other songs did they record?
The band recorded two independent albums in their hometown of Tulsa, Boomerang (recorded in autumn 1994, released in 1995) and MMMBop (released in 1996).

Question: Did those two albums feature their a cappella singing?
Self-contained rewrite: Did Boomerand and MMMBop feature Hanson's a cappella singing?