Here's a whole alphabet of (mainly traditional) songs and tunes (though I had to cheat a bit on X).

A - Douglas's mistress, so they say, but Lady John was far more responsible.
B - Willie Lawrie's retreat should have been called Haig's Downfall.
C - Galashiels hawker's products ... the advertising always lasts longer.
D - Mr Miller thinks Salford's a filthy place.
E - Feeding pigs is not for her, now that she's so friendly with Lord Lambton's heirs.
F - Swift said he could drink, but Turlough usually used Mrs Trench's maiden name.
G - Amidst the northern ice; the captain grieves.
H - She's changed her name from Loving Hannah, and now her hair is black as a raven.
I - Half the village is aroused and chasing her, but all drink her health at the end.
J - You don't meet him every day, but he's buying the drinks now.
K - Instructions to George for a good night's sleep.
L - He was 7 years apprentice but then he changed his trade; now it's his delight.
M - James Yorkston's ghostly purveyor of molluscs.
N - Not usually recommended for night visiting, but our hero keeps them on at all times.
O - Another female seller of molluscs, but this time in 6/8.
P - Robert's description of the Scottish Parliament.
Q - Though they operated, the flower of England is blooming no more.
R - Saved from an untimely fate by the captain's daughter who, no doubt, gave him too much.
S - Cyril's song of lost love leaves no requirement for an American car.
T - He's mad about his Bethlehem home.
U - She was never afraid of goons and ginks (nor even of deputy sheriffs).
V - Tasmania's a second home for young men who would be horses.
W - Rhetorical question Martin asked his servant.
X - Latin Menagerie for the festive season (78 items in all).
Y - He had a handsome face, and all around his hat he wore a band of lace.
Z - If you have any spare cash, a jaunt in Phoenix Park is recommended.

Answers, as usual, on the forum. I suspect this may turn out to be easier than some of the previous quizzes, but collaboration strongly encouraged and comments about songs, tunes, performers (or anything else) welcomed.

Good luck.
Ian