Chant of Solitude (3.5e Feat)
From D&D Wiki
 Chant of Solitude [Music]
You can channel the power of your bardic music to sustain your allies, allowing them to function even after receiving wounds that would cause others to falter.
Benefit: You can expend one daily use of your bardic music ability as an immediate action to provide all allies (including yourself) the benefit of the Diehard feat until the end of your next turn. You can use this feat multiple times consecutively to keep yourself and your allies conscious. Even while this feat is active, you or your allies die if reduced to -10 hit points or lower. This feat does not function in an area of magical silence