Digital music sales are on pace to, as usual, break sales records for the year, with a 15% increase in full album sales through August, according to Nielsen Wire. Last year was the first year that saw more than 100 million digital album sales, according to Nielsen. Apple's (AAPL) iTunes, Amazon.com (AMZN), Google (GOOG) Play and other Web stores sold 1 billion digital tracks through August, on pace to beat the record 1.3 billion sold during all