Operation Ivy were a Californian ska-punk band that featured Rancid’s Tim Armstrong on guitar and vocals and Matt Freeman on bass.

The line-up was completed by lead vocalist Jesse Michaels, and drummer Dave Mello. Operation Ivy pioneered ska-core, a mix of ska-punk and hardcore. The band only lasted two years (1987-1989) but they produced some great records in their short life - Sound System, Unity and Bankshot to name but three.

O is also for… Ob-La-Di, Ob-La-Da: As you can see here, this is Macca having a stab at Desmond Dekker style ska/reggae… he even used Desmond’s name in the lyrics. Ob-La-Di, Ob-La-Da is your classic 'love it or hate it' Fabs song. John Lennon hated it. Dekker later recorded his own version.