So far I see 30mins and 30 seconds. Does anyone know of any other sources or items that increase song duration?

Code:
SOURCE					Duration in seconds
Bard 1						60
Bard 1-20					600
Aria 1-3		Fatesinger T3 		180
Sustaining Song		Spellsinger T4		30
Arcane Aid		Spellsinger T4		30
Frolic			Spellsinger T4		30
Spell Song Trance	Spellsinger T3		30
Song of Arcane Might	Spellsinger T4		30
Lingering Songs 1-3	Spellsinger T1		180
Spellsinger Core 1-6	Spellsinger Core	180
Prodigy			Spellsinger T5		30
Spellsinger Vigor	Spellsinger T5		30
Echo of the XXXX	Fatesinger T3 or T4 	60
Lasting Inspiration	Destiny Feat		360