I had a very sad one several months back, GG...
It was 'In Paradisum' by Durufle, and I just couldn't get it out of my head..:0(
I can still remember waking up to 'Vincent' by Don McClean around 1972, and feeling absolutely miserable for days afterwards - it is such a lovely song too...
On the other hand, Mrs Growster and I recently seem to like making up silly (very rude) words to 'Let's get together' by Hayley Mills! Mrs Growster is also on the case with 'The day we went to Bangor', by Fiddler's Dram!