For the past couple of years, Alex Kapelman has been plagued by an iPhone notification sound that constantly reminds him of one of his favorite songs. He goes on a journey to find out why — and learns that he's not alone.

Reflection on how John Siracusa started writing reviews of Mac OS X for Ars Technica.

A reflection on how John Siracusa began writing reviews of Mac OS X for Ars Technica.

• John's review of Infinite Loop
• John's review of OS X Yosemite
• Blog post announcing the end of his reviews

This extra is brought to you by Backchannel: a better way for developers to collect feedback from beta testers of your iOS apps. Coming soon.

Music for Welcome to Macintosh is by the mysterious Breakmaster Cylinder.