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When you cast this spell, you immediately prepare one spell of 4th level or lower in this spell's slot. The spell must be a spell you could normally prepare in that slot (for example, you could not prepare a wizard spell or a domain spell). The spell works like any spell prepared in the normal manner, including requiring the normal components.

Like a bard spell, casting spellsong always requires a verbal component, and you cannot use Silent Spell or similar effects to cast the spell without a verbal component.