FeatsAlluring (SaS): +2 DCs on mind-affecting abilities and charisma based supernatural abilities.
Battle Dancer (PHBII): if your buffing an ally with music and move 5ft, you gain +2 moral to attack.
Chant of Fortitude (CAd): expend a music use to give allies the diehard feat.
Chant of the Long Road (CS): expend a music use to ignore nonlethal damage from hustling.
Chord of Distraction (CS): expend three uses to render a target flat-footed against a single ally (this thing sucks).
Courageous Rally (HoB): when you inspire courage you can make a free rally check with inspire's bonus to it.
Dragonsong(Draco): +2 to bardic music DCs, also minor skill boosts.
Dragonfire Inspiration (DM): <inspire courage's bonus>d6 <elemental> damage added to all attacks instead of inspiring.
Extra Music (Cad): +4 bardic music uses.
Forbidden Lore (HoB): +2/+4/+6 to bardic knowledge depending on taint level if the inquiry is horror-like.Green Ear (?): bardic music affects plants.
Ice Harmonics (FB): expend a use of music to make ice explode.
Ironskin Chant (CAd): expend a use of music to grant dr 5/- to one target.
Lingering Song (CA): +1 minute to a song's duration after you stop singing.
Music of Growth (EB:ECS): what augment summoning sounds like.
Obscure Lore (Online/CW): +4 insight to bardic knowledge.Requiem (LM): bardic music affects undead but at half the duration.
Snowflake Wardance (FB): expend a music use to add cha-to-att, lasts one round per perform rank.
Song of the Heart (EB:ECS): +1 bardic music bonuses.
Song of the White Raven (ToB): swift action to use inspire courage.
Soothe the Beast (EB:ECS): bard perform based version of a ranger's wild empathy.
Sound of Silence (CS): expend a music use to deafen a target.
Subsonics (CAd): sing solo, as in so low they can't hear you.
Sunken Song (SW): you can sing underwater.
Warning Shout (CAd) expend two music uses to grant a +5 bonus to the target's next reflex save.
Windsinger (SW): expend a music use to change wind direction for sailing.
Words of Creation (BoED): double bardic music bonuses.
Feats - Bardic Music SpellcastingArcane Accompaniment (PHBII): expend spell slots to extend music's duration.
Captivating Melody (CM): expend a use to add +2 to your next bard-only enchantment spell's dc.
Disguise Spell (CAd): disguise your verbal/somatic components as a music act.
Enchanting Song (RoS): expend a use to add +1 to your next enchantment spell's dc.
Lyric Sepll (CAd): expend bardic music uses to cast your spells.
Metamagic Song (RoS): expend bardic music uses to pay for metamagic costs.
Melodic Casting (CM): cast spells/use items while maintaining bardic music, you can also use preform for concentration checks.
Misleading Song (RoS): expend a use to add +1 to your next illusion spell's dc.
Talfirian Song (FR:RoF): a heighten/illusion only version of metamagic song.
ItemsBadge of Valor (MiC): 3/day +1 to inspire courage's bonus, can be applied after inspiring.
Dove's Harp (MiC): when you use bardic music, allies within 60ft gain fast healing 3 for one minute.
Harmonizing (MIC 35): +1 enhancement, basically lingering music and +2 to preform checks, skip the feat and buy this.
Headband of Lore (Online): +5 competence to bardic knowledge.
Headband of the Binder (Online): +4 sacred to bardic knowledge.Masterwork Instruments (Song & Silence/CAd): improves various bardic music traits.
Vest of Legends (DMGII): +5 to bard level for bardic music.
Lantern of Artistry (DL:HOotS): +5 rounds to the duration of bardic music & +6 sacred to perform checks.Specific WeaponsCrystal Echoblade (MiC 49): while under the effects of your own music add one half your bard level to damage.
Songblade (A&E): +1 bardic song per day for 6k. Store in an extra dimensional pocket while sneaking.
SpellsInspirational Boost (SpC): +1 to inspire courage's bonus.
Harmony (FR:PGtF): +1 to inspire courage's bonus, can delay using it for up to a minute.
Harmonize (RoS): maintains bardic music for a bit, there is a greater version too.
OtherBardic Sage (UA): +2 to bardic knowledge.
Chakrabind[Crown] (MoI): +2 insight to bardic knowledge checks.Chakrabind[Throat] (MoI): +1 bardic music per day.
Note: an 8th level bard with masterwork lute, song of heart, harmony, badge of valor, and words of creation grants a +12 attack bonus for dragonfire inspiration, inspirational boost can then be applied and restacked below words of creation for +14.