Producing Music for iTunes

Here's a short but informative introduction to the idea of tailoring your production to a specific platform, in this case Apple Music. Written by Tom Frampton, whom you may know under the tradename Mastering the Mix, and seller of the recently-discussed EXPOSE analysis utility.
 
Yes, I pretty much dismissed EXPOSE as being ultimately useless for most of us, and this article makes no secret that it's a sales pitch for EXPOSE. But there's no doubt Tom knows his stuff and consistently offers solid advice on his blog.
 
Key points of the article:

• Leave at least 1 dB of headroom to accommodate the AAC encoding process 
• Apple Music streams at an average of -14 LUFS (plus or minus 2) but only if Soundcheck is enabled
• Commercial music still routinely ignores this standard and still tends to master things too loud