If you watched the previous episode, the last 3-4 minutes of it had an amazing piano piece.
John Swihart, the composer, just uploaded it to Sound Cloud with a download link!

Enjoy!

John Swihart - You`re All Alone (https://soundcloud.com/john-swihart/himym-819-3m05-youre-all-alone)

Thanks!

Thank, buffyfan84.