Sourcebooks is launching its "2Go" line of e-books with separate enhanced e-book lines in classical composers, presidential speeches, and poets. The e-books are designed to give an introduction to the subjects, complete with audio excerpts of music, speeches, and readings. The books will sell for $2.99. The composers and presidential series will launch March 21, with the poets series coming in April.

The composers in the series: Johann Sebastian Bach, Wolfgang Amadeus Mozart, and Ludwig van Beethoven.

The presidents: Ronald Reagan, Franklin Delano Roosevelt, John F. Kennedy, and George Washington.

The poets: William Butler Yeats, Robert Browning, Walt Whitman, and Alfred, Lord Tennyson.