Songs in head constantly and can't sleep

Yep. Me too.

Ear pods have been a life changer. Radio 4 on quietly usually works, or an audiobook/podcast carefully chosen to be not too boring but not too exciting

Stress does this to me too. For me, playing a simple game on my phone helps until I'm so tired I just drop off.

It's easier said than done but the only cure is eliminating the actual source of the stress.

I basically never get this any more since I changed job 6y ago.

Have you tried yoga nidra? Ally Boothroyd on YouTube is really good - search ‘ally boothroyd yoga nidra for sleep’.

Also try white/green/brown noise etc.

White noise music has helped me loads.

I’ve done a full bottle now of Nytol in last few weeks and I also think that has been helpful at times.

Try cognitive shuffling

I'm glad this is 'normal'! I get one line from a song stuck playing over and over and over. It plays fast and without rhythm, getting faster if I'm stressed. When I'm bad it wakes me up.

No advice, just sympathy. I like rain videos to drown the noise but tricky when sharing bed with DP.

I have similar, (although for me it is going through the hymn and prayers drummed into me at my ultra religious school over 50 years ago - I'm not even religious!) definitely worse when I am stressed (Which is most of the time).
I've tried sleeping pills but they leave me so completely zonked the next day I can't function.

Things that help a little bit
Doing something to distract my brain I find a crossword or some kind of puzzle works better than reading because you have to apply concentration which theoretically overrides the DIY concert/mass !
I listen to guided meditations (look up guided meditations sleep on you tube)
My friend who is a yoga teacher made me a Yoga Nidra CD, I imagine yoga nidra also available on you tube. It goes through relaxing every part of your body, it works quite well for me (listen to a few to find a voice you like)

Nothing works perfectly, but ome things help sometimes. I also get all kinds of crazy whirling thoughts and other sleep disturbances like auditory hallucinations, so I assume it is all part of general disordered sleep.
I sympathise though it is awful and utterly exhausting.

My ADHD brain does this to me when I'm not medicated. Can be the same song for weeks, on loop, same part, over and over again.

I also find an audiobook played over earpods and set to switch off if the phone doesn't move for 20 minutes works. I mostly go for cosy mysteries, nothing with any suspense or too attention grabbing. Most nights I end up waking several times, scrolling back 15 minutes to the point where I fell asleep, and catching the next five minutes before drifting off again.
Doesn't work if the audiobook is too scary, too amusing or is read by someone with too lively a voice, and sometimes it to takes longer to drift off, but having voice reading a story is enough to keep my thoughts (and brain worms) from getting stuck on a hamster wheel.

Stress does that to me - if I'm waking between 2 and 4 and can't get back to sleep, I guarantee it's because there's a lot on, and I need to take an afternoon off and do as little as possible.

When I can't get back to sleep, I put on an audio book (I don't have a partner, so I can just play it outloud). I don't even really listen to the book, it's just having a pleasant, quiet voice reading out loud occupies the bit of my mind that would normally have thoughts racing, and lets me drop off.

Alternatively, I also have some hypnosis tapes (Paul Mckenna) which give me a solid 30 mins nap if I need it in the afternoon to get through the day (I just put on a random one). And I've had some success with the singing bowls/chimes/tones on Youtube.

I definitely think Ebooks are the best at night, and a 30 minute hypnosis tape in the day though for me.