Songbird

You intone this simple spell and your control over your voice improves, your unruly hair straightens, and your flesh radiates a healthy glow. You’re ready for showtime.

(Spell Compendium, p. 195)  
Originally posted on D&D tools

Transmutation

Level: Bard 0,
Components: V, S,
Casting Time: 1 round
Range: Personal
Target: You
Duration: Performance +1 hour or until discharged; see text

You acquire an even greater charisma when you perform. Anyone who hears or views your performance becomes favorably inclined toward you. This spell grants you a +1 competence bonus on your next Charisma-based check involving any one person who saw the performance. This effect lasts for the duration of your performance and up to 1 hour immediately following. You must begin the performance within 1 hour of casting the spell for it to have any effect.