I just heard Rolf Harris singing the end of a song I hadn't heard for years, which ended 'drinking buttermilk all week long, whisky on a Sunday'. It also reminded me of a Scottish folk song I hadn't heard for even longer which included 'He is handsome, he is pretty, he is the ? of ?? city, ???? 123 ??? won't you marry me'. (each ? represents a forgotten syllable). Not bad for a gap of about 30 years considering. Both are very well known, but needless to say, neither on my lyric searches. I'll have to wait for them to bring out the rap versions before they pop up there...
And the titles are?

The first song is called 'Whiskey on a Sunday' by Glyn Hughes.

see here
and here (you can even listen to a piece of the song)

The second song, with slightly different lines (the he's become a she ), can be found here and
here.

Very good work Leau, thanks a lot. I would have guessed at the first one though I had no actual idea, and it was one of many in a small musical entertainment I played the keyboard for 20 years ago. All the words had been changed to fit the life of the person the performance was about (he'd also done this writing himself) and I heard this tune, along with many other traditional songs I liked, for the first time. He also altered the titles and I was so busy learning them all I didn't stop to think of checking the real titles.
The second used to be on the radio a lot, and of course depended on whether it was sung by a man or a woman. Clearly the popular version we used to hear was sung by a woman, and now I can track down the music and learn to play them right through. Edited to add: I knew it could be 'he' or 'she'. Now I know I chose the wrong side- just read the bits I forgot!