You could try BirdNET. It's developed by The Cornell Lab of Ornithology. Although it's American it claims to have covered most European species. It's available for both Apple and Android and it's free so nothing to lose. There's quite a good explanation video of how to use it on the link I've given above. Otherwise it's not all that intuitive.
Personally, I've never got on with these Apps. I prefer the old fashioned method of seeing the bird that's singing and identifying it. That way I find it sticks in the mind better.
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Regards,Tony
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