Matt Lindahl signs with Purity Dairy Matt Linhahl has begun a series of commercials and print adds for Purity Dairy By Staff Writer Sam Crawley Nashville, TN - Matt Lindahl has signed with Purity Dairy to do a series of commercials and print ads. Purity Dairies, offers more than 100 products and distributes them throughout Tennessee, Alabama and Kentucky - the ads are expected to be aired and shown throughout the region. Matt, was one of the finalists in last year's "Nashville Star" contest and has since been recording and touring with that cast show.