Oh, it's not that kind of contest, Mr. Happy. §;-x

Some of those are almost indecipherable without a hint. But here is the jumbled list of the real titles.

A - Ebb Tide
B - Putting On The Ritz
C - Luck, Be A Lady Tonight
D - Boogie Woogie Bugle Boy Of Company B
E - Satin Doll
F - Daydream Believer
G - Summer Wages
H - Don't Let The Stars Get In Your Eyes
I - The Old Oaken Bucket
J - It Had To Be You
K - Ah, Sweet Mystery Of Life, At Last I've Found You
L - I'm In The Mood For Love
M - Cockles & Mussels
N - Tenting Tonight On The Old Camp Ground
O - The Wabash Cannonball
P - Morning Has Broken
Q - Blueberry Hill
R - Across The Great Divide
S - Don't let your deal go down.
T - When The Red, Red Robin Comes Bob Bob Bobbin Along
U - In The Mood
V - I'm Forever Blowing Bubbles
W - Hard Times Come Again No More
X - Oh How I Hate To Get Up In The Morning