Your eldritch knight training is closely tied with your musical training.
Benefit: Your eldritch knight levels stack with your bard levels for purposes of determining the number of times per day that you can use your bardic performance abilities. In addition, every even level of eldritch knight that you attain (2nd, 4th, etc.) counts as a bard level for purposes of determining which performance abilities you can use and how powerful your performances are.
Undefeatable: The Collected Feats Sourcebook, Copyright 2009 – 2010, Louis Porter Jr. Design, Inc. Undefeated, Copyright 2011, Louis Porter Jr. Design, Inc.