Songs aren't ads (except the songs that are ads, of course), they are the final product, and I just got it for free. If I record the radio, I've gotten what I wanted (if the DJ doesn't talk over it at some point). That's why there's so much effort put into trying to stop "pirating" (DJs talking over songs is one of those measures).
Movie trailers are certainly ads but, lately, I avoid trailers for movies I know I want to see even harder than regular ads (fingers in ears "LA LA LA" type stuff) because I know they're going to spoil everything. I can't believe how many times all the twists and final scenes are shown in trailers. The Ready Player One trailer even spoiled the book for me because SPOILER I hadn't learned about Aech's real identity yet, just seeing the cast was enough to accidentally deduce it (and not just 1, but 2, "surprising" aspects of the character).
Superbowl ads did tend to be good before they became a "cultural product". Now they're all just Idiocracy level shit.
Bit of a tangent on the "song is an ad" thing: Now that our personal information is the final product, like a song is, and enough people are finally starting to realize that can lead to trouble (yet still don't want to pay for anything with money) they want exactly what media companies have been seeking for decades, DMCA and DRM for their personal information. As we all know, DMCA and DRM suck for everyone involved. They don't stop copying and inconvenience both creators and "legitimate" users far more than "pirates". The reality is simple, if you don't want your information "product" to be consumed, just refuse to give it to anyone.
Edit: "Consumed" is the wrong word, information isn't a consumable product in that it's not gone afterwards. What's the right word? Whatever it is, that's what we should be using to talk about the act of receiving information.
Edit again: "Received" is better. duh.