The strains of the song came through as clear and loud as they ever had last October in what would be Michael Morse's final at-bat as a member of the Washington Nationals. The fans at Nationals Park stood and sang the words to Morse's walk-up song, A-ha's "Take on me" with delirious joy. Morse obliged with a hard single up the middle. As far as final moments go, Morse's is one Nationals fans will remember fondly. The Nationals traded Morse to the Seattle Mariners on Wednesday as part of a three-team trade that helps put them well on their way to re-stocking their farm system by getting back right-handed prospect A.J. Cole from the Oakland Athletics. The Nationals traded Cole to the A's last winter as part of the package for left-hander Gio Gonzalez. The Nationals also received minor-league right-hander Blake Treinen from the A's and will get a player to be named from Oakland in the deal, which also sent catcher John Jaso from Seattle to Oakland.