Funny, because there was trouble, but it's actually the opposite of what you might expect. Apple was the one who was getting sued for entering into the music industry.
Sure, I wouldn't assume they'd just ignore it - the comparison to i-prefixed products just seemed inadequate, and the 'apples and oranges'-ref essentially wrote itself :-)
Fun fact from this - System 7 added alert sounds, and Apple Legal was worried about the name “chime” being too musical. The annoyed creator of the alert sounds renamed it “Sosumi” (pronounced “so sue me”) and told them it was Japanese.
In fact they (and Facebook, and others) are in so many businesses that any trademark they claim is going to have wide impact.