There's nothing wrong with Edvard Grieg's In the Hall of the Mountain King. It's a lovely piece of music.
There's nothing wrong with Sinclair's ZX Spectrum. It's a lovely piece of hardware.
There's very little wrong with Matthew Smith's Manic Miner. It's a lovely game.
Unfortunately, the game tries to combine music and gameplay on the humble Spectrum. It's an experience that makes me want to glue my ears shut with expanding foam. But listen for yourself...