Janet & Nelly Call On Me @ iTunes

I found Janet's new song is listed on iTunes.I haven't seen its promo 12inch (I saw some Promo CDs). So DJ promo has no promotional functions anymore?
BTW, I saw Justin Timberlake's new cut was available on 12inch promo at Manhattan Records.
But I didn't get that. I studied that there is no advantage to get a promo disk when it has no rare trax.
Janet@MySpace
JD shouts "Ya know this is!" but Not "So So Def" on this track. A brand strategy is difficult. Digg!
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