DJ Bronson is making a playlist for a demo CD; he is trying to decide what 10 songs to play and in what order they should be played. Step 2 of 2 : If he has his choices narrowed down to 7 blues, 6 rock, 4 country, and 6 jazz songs, and he wants to play all 7 blues songs, how many different playlists are possible? Express your answer in scientific notation rounding to the hundredths place.