use Perl

#!/usr/bin/perl -w

use warnings;
use strict;

# Get the number of minutes from the command line, or default to 10
my $minutes = shift || 10;
my $seconds = $minutes * 60;

# XXX This doesn't verify the media type, but should.

my @filelist = `mdfind 'kMDItemDurationSeconds > $seconds'`
    or die "You don't have any songs over $minutes minutes long!\n";
chomp @filelist; # Remove trailing newlines

my @fileinfo;
for my $filename ( @filelist ) {
    my %fields;

    # Call mdls on the file and scan each line
    for ( qx{mdls "$filename"} ) {
        # Extract the keys and values
        if ( my ($key,$value) = /^kMDItem(\w+)\s+=\s+(.*)/ ) {
            # Strip surrounding parentheses and/or quotes
            $value =~ s/^\(|\)$//g;
            $value =~ s/^"|"$//g;
            $fields{$key} = $value;
        }
    }
    push( @fileinfo, \%fields );
}

# Sort in decreasing order of length
@fileinfo = sort
    { $b->{DurationSeconds} <=> $a->{DurationSeconds} }
    @fileinfo;

# Print the specs for each song
for my $file ( @fileinfo ) {
    printf( qq{%2d:%02d "%s" by %s from "%s"\n},
        $file->{DurationSeconds}/60, $file->{DurationSeconds}%60,
        $file->{Title}, $file->{Authors}, $file->{Album}
    );
}

which gives this output

20:34 "2112" by Rush from "2112"
19:59 "The Fountain Of Lamneth" by Rush from "Caress Of Steel"
18:36 "Alice's Restaurant Massacree" by Arlo Guthrie from "The Best Of Arlo Guthrie"
18:07 "Cygnus X-1 Book II, Hemispheres" by Rush from "Hemispheres"
17:06 "Dogs" by Pink Floyd from "Animals"
16:44 "An American In Paris" by George Gershwin from "Greatest Hits"
16:20 "Rhapsody In Blue" by George Gershwin from "Greatest Hits"
16:10 "Dogs" by Les Claypool's Frog Brigade from "Live Frogs Set 2"
15:50 "2112" by Rush from "All The World's A Stage"
15:47 "Disgustipated" by Tool from "Undertow"
15:27 "Sleep Like A Child" by Joss Stone from "Mind Body & Soul"
14:56 "Working Man / Finding My Way" by Rush from "All The World's A Stage"
14:22 "Telegraph Road" by Dire Straits from "Love Over Gold"
14:15 "Do You Feel Like We Do" by Peter Frampton from "Frampton Comes Alive!"
13:57 "Full Metal Jackoff" by Jello Biafra With D.O.A. from "Last Scream Of The Missing Neighbors"
13:47 "Third Eye" by Tool from "&#8730;&#220;nima"
13:38 "Rime Of The Ancient Mariner" by Iron Maiden from "Powerslave"
13:35 "Shine On You Crazy Diamond" by Pink Floyd from "Pulse"
13:09 "Rime Of The Ancient Mariner" by Iron Maiden from "Live After Death"
13:03 "Rime Of The Ancient Mariner" by Opera IX from "A Call To Irons - A Tribute To Iron Maiden"
12:59 "Any Three Days" by Thee Speaking Canaries from "Songs For The Terrestrially Challenged"
12:43 "Smiling Faces Sometimes" by The Temptations from "Psychedelic Soul"
12:34 "The Necromancer" by Rush from "Caress Of Steel"
12:27 "Blinding Light Show/Moonchild" by Triumph from "King Biscuit Flower Hour Presents...Triumph In Concert"
12:19 "Didn't We Deserve A Look At You The Way You Really Are" by Shellac from "Terraform"
12:18 "Through It All There's You" by Robert Palmer from "Sneakin' Sally Through The Alley"
12:10 "Xanadu" by Rush from "Exit... Stage Left"
12:08 "Sweet Dreams" by Probot from "Probot"
12:04 "Papa Was A Rollin' Stone" by The Temptations from "Psychedelic Soul"
11:57 "By-Tor And The Snow Dog" by Rush from "All The World's A Stage"
11:46 "Christo Redemptor" by Charlie Musselwhite from "Blues Masters, Volume 4: Harmonica Classics"
11:44 "Pigs (Three Different Ones)" by Les Claypool's Frog Brigade from "Live Frogs Set 2"
11:37 "Slick / Clownmaster / Tilted" by Sugar from "Bleeding"
11:37 "Suite Sister Mary" by Queensry\U0308che from "Operation: Livecrime"
11:31 "Packard Goose" by Frank Zappa from "Joe's Garage"
11:30 "Pigs (Three Different Ones)" by Pink Floyd from "Animals"
11:30 "One Bourbon, One Scotch, One Beer [Live]" by George Thorogood from "Extended Versions [Live]"
11:23 "Heart Of The Sunrise" by Yes from "Fragile"
11:20 "Prologue And Tradition & Main Title" by Original Cast from "Fiddler On The Roof"
11:20 "Tonight/You Shook Me All Night Long" by Charlie Robison from "Live"
11:19 "Crash And Burn" by Sheryl Crow from "The Globe Sessions"
11:16 "Tenth Leaving Train" by Eleventh Dream Day from "Prairie School Freakout"
11:13 "Sheep" by Les Claypool's Frog Brigade from "Live Frogs Set 2"
11:11 "Xanadu" by Rush from "A Farewell To Kings"
11:09 "Free Bird (demo)" by Lynyrd Skynyrd from "Lynyrd Skynyrd (pronounced 'leh-'ne&#195;&#197;rd 'skin-'ne&#195;&#197;rd)"
11:08 "Cortez The Killer" by The Church from "A Box Of Birds"
11:08 "Rock Bottom" by UFO from "Strangers In The Night"
11:07 "Reflection" by Tool from "Lateralus"
11:07 "I Heard It Through The Grapevine" by Creedence Clearwater Revival from "Cosmo's Factory"
11:06 "Funeral For A Friend/Love Lies Bleeding" by Elton John from "Goodbye Yellow Brick Road"
10:57 "The Camera Eye" by Rush from "Moving Pictures"
10:47 "Sorrow" by Pink Floyd from "Pulse"
10:40 "Smash" by Offspring from "Smash"
10:40 "Marquee Moon" by Television from "Marquee Moon"
10:39 "Suite Sister Mary" by Queensry\U0308che from "Operation: Mindcrime"
10:33 "Adagio; Adanto Con Moto: Concerto In F For Piano And Orchestra" by George Gershwin from "Greatest Hits"
10:30 "Do I Do" by Stevie Wonder from "Original Musiquarium 1"
10:25 "Cygnus X-1" by Rush from "A Farewell To Kings"
10:25 "Flood Down In Texas" by Stevie Ray Vaughan from "Blues Masters, Volume 3: Texas Blues"
10:19 "Child In Time" by Deep Purple from "The Very Best Of Deep Purple"
10:18 "Sheep" by Pink Floyd from "Animals"
10:14 "Blues Power" by Albert King from "Blues Masters, Volume 7: Blues Revival"
10:14 "Coma" by Guns N' Roses from "Use Your Illusion I"
10:06 "To Tame A Land" by Morgion from "A Call To Irons - A Tribute To Iron Maiden"
10:05 "La Villa Strangiato" by Rush from "Rush In Rio"