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0th level
Summon Instrument: Carry around a flute only you can play! Embarrass your enemies! Amaze your friends!
Ghostharp: An instrument plays a song over and over for 24 hours. If you can't find a use for this, you're not trying hard enough.
1st level
Disguise Self: Fun for the whole family.
Friendly Face: +5 on Diplomacy and Gather Information all day. Pretty nice if you need another bonus.
Serene Visage: +CL to Bluff checks. Stacks with Glibness, which you can also Persist. See how many people you can fool into thinking you're the President of the World.
Expeditious Retreat: +30ft to your move speed, all day. Kicks dust in the Monk's face.
Undersong: Make Perform checks instead of Concentration. Useful when stacked with ToB stuff that uses Concentration, I guess.
2nd level
Detect Thoughts: You don't really need this if you have your +50 to Bluff, but it's always nice before that.
Tongues: For when people you want to lie to speak a different language.
Elation: +2 STR, DEX and +5ft movement to every ally within 80 feet. If you're leading an army of peasants, they'll need this.
Heroism: +2 bonus on attacks, saves and skills. Probably lets you catch up to the Fighter's to-hit, and also stacks with Glibness and Serene Visage.
Darkness: Now everyone can see the darkness of your soul, but not you.
Force Whip: Handy if you're in a jungle and don't want to get violated by bears as you sleep. Excellent for when you make enemies of Druids.
Bladeweave: If you hit them, and can hit them again as a free action, they're Dazed. Nothing (or nearly nothing) is immune to Daze, and you can do this all day, baby!
Blur: Run of the mill 20% miss chance.
Invisibility: Broken on attack regardless of Persist, but fun if you're not planning to. Use the Swift version if you have Rapid Metamagic.
Mirror Image: Sure, the images might get grokked, but you get to keep the ones that don't all day.
Mirror Move: This build is fairly feat-intensive. Borrow some from friends!
Phade's Fearsome Aspect: +5 Intimidate, +10 Disguise, Demoralize as a swift action. Nobody will make fun of you again.
Reflective Disguise: Negate racism for a day.
Alter Self: You know what this spell does. You know you'd love to have it up all day.
Animal's Bonus spells: If you can't afford the +4 item, this is almost as good.
Swift Fly: Who cares that this only lasts one level, you're zooming around all day!
Harmonize: If you have any Bardic Music left, start one as a Move action. You can start another effect as a Swift action through that one White Raven feat, and a third as a standard action. Three songs in one turn? Damn straight.
Iron Silence: Your armour no longer penalizes Hide and Move Silently. All day. Enjoy.
Sonic Weapon: +1d6 to all your weapon's attacks. What resists Sonic? Practically nothing.
3rd level
Wounding Whispers: More Sonic damage to stuff that attacks you.
See Invisibility: Ruin some assassin's day.
Speak With Animals: If you don't want to Force Whip all the animals away, use this instead.
Verraketh's Shadow Crown: +4 to Perform.
Warcry: Enemies in a cone cower for a day. Have fun.
Daylight: You get to be shiny. Woo.
Displacement: 50% miss chance. Add the 20% from Blur and enemies miss you 60% of the time.
Invisibility Sphere: Bring along some friends in your all-day bubble. Great for infiltration.
Allegro: Expeditious Retreat, Mass. Now everyone gets to laugh at the Monk.
Blink: Stack this on top of Displacement and Blur and you're looking at an 80% miss chance before AC.
Gaseous Form: Be a cloud all day. I'm sure you can find a use for it.
Glibness: YES. With +50 to Bluff from this and Persisted Serene Visage, you can go around shooting nonmagical Suggestions at people all day. If you can get your hands on Telepathy, you can pretend to be someone's conscience, too.
4th level
Freedom of Movement: All day escaping from grapples. Nice.
Inspired Aim: +2 to ranged attacks for everyone in 40ft radius. If you have a bunch of followers, by all means.
War Cry: +2 attack/damage (or +4 on a charge) and enemies are panicked unless they save. Excellent upgrade from Bladeweave unless fighting fearless foes.
Fugue of Tvash-Prull: Cheese out your Perform check and crush your enemies with this emanation.
Greater Invisibility: Like Invisibility, only you get to attack too. All day.
Spectral Weapon: Make all attacks as Touch attacks. Since you're Invisible, they're also flat-footed. Never miss again!
Sirine's Grace: +4 to CHA and DEX, +8 to Perform, CHA to AC and an INT-damage touch attack. Pretty sweet (thanks, Claudius Maximus!)
Blinding Beauty: Everyone looking at you gets blinded. Potentially more useful than invisibility with one unfortunate caveat that's fluff-only.
5th level
Revenance: This would be just like a Resurrection except the target dies at the end of the day. Not so hot but not bad if you really need Bob the Fighter alive.
Greater Heroism: The +4 bonus, temp HP and immunity to fear is very nice.
Improved Blink: None of the drawbacks of regular Blink and a bunch of benefits. Mostly take this over Greater Invisibility if your enemies See Invisible.
Unfettered Heroism: 1 action point per round, all day. I'm not sure what they do but it's probably pretty good.
6th level
Snowsong: +4 to attacks and CHA, 15 Cold resistance, fast healing and +1d6 cold damage on attacks. To everyone in a 30ft radius. If you're all about boosting the mooks (like if you're a BBEG), this is a pretty great capstone if you don't run out of feats. (Thanks to Darkmatter!)