Three weeks after the introduction of variable pricing on the iTunes Store, labels are seeing lower unit sales for both $.99 and $1.29 songs. Citing sales numbers from Nielsen SoundScan, Billboard reports that out of the Top 100 tracks, the 67 that remained at $.99 sold a total of 29% fewer units than they did the week before the price increase, resulting in a 29% drop in revenue, while the 33 songs that were raised to $1.29 saw an aggregate drop…
