Possible Clues:

• Small songbird
• Small garden bird
• *Small European warbler or, alternately, a wreath for the rear?
• See bird in tube, lit badly
• Small cobalt-colored bird
• By the sound of it, blowed if that's such a shady little bird
• Built unusual structure on tree top and first egg's then laid in it
• Colourful garden bird
• Creature unhappy with useless person
• Let It Be almost ruined with inclusion of classy little singer