Ah. Herself and I listened to the whole Shaggs album once on a car trip through a desert. It is in the tiny category of albums that have some real wonder in 'em, but you can't and perhaps shouldn't listen to more than once.
Really, you must listen to this record.
Once.

‘The most stunningly awful wonderful record’: how the Shaggs became rock’s most divisive band
Often completely out of tune and rarely in time, the group of sisters forced to play together by their father gained an army of fans from Frank Zappa to Kurt Cobain. A new documentary celebrates their cult status