In April 2003, version 4.0 introduced the iTunes Store in October, version 4.1 added support for Microsoft Windows 2000 and Windows XP. Version 3 dropped Mac OS 9 support but added smart playlists and a ratings system.

Release 2.0 added support for the new iPod. Originally a Mac OS 9-only application, iTunes began to support Mac OS X with the release of version 1.1 in March 2001. Casady & Greene ceased distribution of SoundJam MP on Jat the request of the developers. Macintosh users immediately began poking through iTunes's resource fork, where they discovered numerous strings and other resources that indicated that iTunes was a re-engineered Sound Jam MP. Īpple released version 1.0 of the program under a new name 'iTunes' on Januat Macworld San Francisco. At Apple, the developers simplified SoundJam's user interface, added the ability to burn CDs, and removed the program's recording feature and skin support. At the time of the purchase, Kincaid, Jeff Robbin and Dave Heller left Casady & Greene to continue development of the program as Apple employees. Apple purchased the program from Casady & Greene in 2000.

An iTunes-compatible CD or DVD recorder to create audio CDs, MP3 CDs, or backup CDs or DVDs.Apple based the initial release of iTunes on SoundJam MP, a program developed by Bill Kincaid and released by Casady & Greene in 1999.

An Internet connection to use Apple Music, the iTunes Store and iTunes Extras.

A screen resolution of 1024 by 768 or greater 1280 by 800 or greater is required to play an iTunes LP or iTunes Extras.

Playing 1080p HD video requires a 2.4GHz Intel Core 2 Duo or faster processor 2GB of RAM and an Intel GMA X4500HD, ATI Radeon HD 2400, NVIDIA GeForce 8300 GS or better.

Playing 720p HD video, an iTunes LP or iTunes Extras requires a 2.0GHz Intel Core 2 Duo or faster processor 1GB of RAM and an Intel GMA X3000, ATI Radeon X1300, NVIDIA GeForce 6150 or better.

Playing standard-definition video from the iTunes Store requires an Intel Pentium D or faster processor, 512MB of RAM and a DirectX 9.0–compatible video card.

A PC with a 1GHz Intel or AMD processor with support for SSE2, and 512MB of RAM.

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