Consider:—
[ul]
[li]“Hymn 43” by Jethro Tull [/li][li]“48 Crash” by Suzi Quatro [/li][li]“Funk 49” by the James Gang [/li][/ul]
All of these came out within a few years of each other, in the early 70s.
What’s going on here?
And “43% Burnt” by the Dillinger Escape Plan. But that was very recent.
Even more erie is that, in 1970, three of the top 40 hits had H2O in their titles: Raindrops Keep Fallin’ on my Head, The Tears of a Clown, and Bridge over Troubled Water.
Spooky.
Then there’s “45” on Elvis Costello’s latest album . . .
There’s also U2’s “40”. . .
In addition to “Funk 49,” the James Gang also did “Funk 48”
46 and 2 by Tool. Supposed to be something about chromosomes. I think you have to be stoned to understand.
Stars on 45s
Haj
And the classic “39-21-40 Shape”
http://www.thepeaches.com/music/randb/392146.txt
(Don’t know why they titled if “46,” though
“Forty to One” by Peter Wolf
“Forty-Eight” by Pentangle
Sublime: “40 Oz. to Freedom”
“46 Days” - Phish
“A Pirate Looks At 40” - Jimmy Buffett
“44 Blues” - Roosevelt Sykes (I like the Little Feat cover)
“Must Be 45 Ways To Leave Your Lover” - early, unreleased demo by Paul Simon. 
“88 Lines about 44 Women”- the Nails
“49 Bye-Byes” - Crosby, Stills, & Nash
“48” - John Renbourn
“42nd Street”
#41 - Dave Matthews Band