I hope RichGirlPlanet does not mind me adding on to the lesson today.
Here's a trick when using the objective case: take out the other subjects and see if the sentence makes sense.
"The Bee Gees were an early inspiration for me, Kelly and Michelle."
"The Bee Gees were an early inspiration for me." Correct
"The Bee Gees were an early inspiration for Kelly and Michelle, and I."
"The Bee Gees were an early inspiration for I." Wrong
