How many bard spells have duration of concentration?

So that they can work well with the spellsong feat?

Edit: Ok let me rephrase that, can someone help me find the names of the spells with a duration of concentration for bard?

Thirty-one. You're welcome.

In order of spell level:

Detect Magic
Lullaby
Mage Hand
Detect Secret Doors
Silent Image
Detect Charm
Solid Note
Animal Trance
Calm Emotions
Detect Thoughts
Hypnotic Pattern
Minor Image
Rage
Summon Swarm
Enter Image
Boiling Blood
Display Aversion
Determine Depth
Detect Relations
Major Image
Seek Thoughts
Haunting Choir
Rain of Frogs
Raging Rubble
Domination Link
Discern Value
Rainbow Pattern
Wall of Sound
Nixie's Lure
Mirage Arcana
Mislead
Frozen Note
Music of the Spheres
Veil
Fool's Forbiddance
Pied Piping