I dare not even listen to the tunes, for fear of being stuck with them.
I have a huge variety of 'favourites;' once heard, with me for the rest of the day. They vary from Boccherini's menuet, via the Marseillaise (learnt at school) to 'classics' like Irving Berlin's 'I've got my love to keep me warm.' The last one has been with me, on and off, since I set the weekly competition 'theme.'
On Sunday I went shooting in Winchester, and the cathedral grounds were full of love, immediately prompting my memory and hey presto! Song back in my head.
The annoying thing is, that I only hum or sing snippets, never the whole tune; it sometimes drives my husband mad.