GET 'Name' IF N>50; PRINT 'Name', N

Prior to 'spring-clean' of the 10383 tracks currently on my iPod, those artists with 50 or more songs are:

Marillion 315 tracks
Jethro Tull 225
Porcupine Tree 217
Yes 188
Cocteau Twins 181
King Crimson 179
Pink Floyd 172
Gentle Giant 168
Vangelis 160
Frank Zappa (solo) 154
Rush 153
Fleetwood Mac 151
Genesis 135
Kate Bush 131
David Sylvian (solo) 124
Brian Eno (solo) 105
Dream Theater 98
The Fall 98
Joni Mitchell 97
Nick Drake 94
John Martyn 91
Steely Dan 83
Peter Gabriel (solo) 80
The Beatles 79
Hawkwind 73
Kraftwerk 72
Sigur Ros 71
Van der Graaf Generator 65
Robert Wyatt (solo) 65
Tim Buckley 64
REM 64
Mike Oldfield 64
Led Zeppelin 62
Caravan 61
This Mortal Coil 58
The Orb 58
The Art of Noise 58
Lucio Battisti 57
Suzanne Vega 55
Dire Straits 54
Supertramp 54
Epsilon Indi 52
Ozric Tentacles 51
Van Morisson 50

Obviously, many of these will have duplicate tracks, but it's a good reflection of my music preferences.