What's a song made for a movie that ended up surpassing the film itself in popularity?Question

There are a ton of examples, but one that comes to mind is "Scotty Doesn't Know", the Lustra song used for the movie "Eurotrip". Lustra's song has an iconic guitar riff and is fairly well known worldwide, but not many people remember that movie, and I was wondering if there are any other examples of songs made for a movie that eclipsed the original in popularity.

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what are the strongest indicators of current UK decline?.

There is a widespread feeling that the country has entered a prolonged phase of decline.

While Brexit is seen by many as the event that has triggered, or at least catalysed, social, political and economical problems, there are more recent events that strongly evoke a sense of collectively being in a deep crisis.

For me the most painful are:

  1. Raw sewage dumped in rivers and sea. This is self-explanatory. Why on earth can't this be prevented in a rich, developed country?

  2. Shortages of insulin in pharmacies and hospitals. This has a distinctive third world aroma to it.

  3. The inability of the judicial system to prosecute politicians who have favoured corrupt deals on PPE and other resources during Covid. What kind of country tolerates this kind of behaviour?