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Because song cards require exerting characters, characters who have been played that turn cannot be used to play song cards

The last ability of Clive's Hideaway will allow you to cast both exiled cards without paying their mana costs (assuming you control four or more legendary creatures at that time.) In a Two-Headed Giant game, Traveling Chocobo's second ability does not affect triggered abilities of permanents your teammate controls

Secret Lair x Street Fighter Lightning Bolt Dealing 3 damage to any target for just 1 red mana has made Lightning Bolt one of the most iconic and efficient spells in Magics history

This is already how it works for double-faced cards, so it makes sense for the same rules to apply here