"I hear you knocking, but you can't come in" - IIRC a 50s Rock'n'Roll tune by the likes of Chubby Checker or someone around the same era.

As for Beethoven's 5th, after death comes knocking, does he mention the salmon mousse?

Peter Gabriel's Sledgehammer might be appropriate, and preferable to MC Hammer's Hammer Time. Or will it be El Condor Pasa - "I'd rather be a hammer than a nail". Or, Nick Cave had a Hammer Song, or DEVO released 'If I Had A Hammer' in 1990-ish. Or ... or have I run out of hammer-inspired pop references?

I think I have.