The word soundtracks is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 21
Highest Scoring Words With Friends™ Plays In The Letters soundtracks
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Seven Letter Word Alert: (29 words)
astound, candors, cantors, cartons, castors, corands, costars, cratons, cuatros, custard, ductors, korunas, outrank, rotunda, rotunds, sanctus, strands, sunstar, toucans, tundras, uncarts, uncords, uncorks, uncross, undocks, unsorts, unstack, unstock, untrack