special Christmas episode
... that the swing group Big Bad Voodoo Daddy performed music for a special Christmas episode of Phineas and Ferb?
... that the <a href="./Swing_music" id="mwBGQ" rel="mw:WikiLink" title="Swing music">swing</a> group <a href="./Big_Bad_Voodoo_Daddy" id="mwBGU" rel="mw:WikiLink" title="Big Bad Voodoo Daddy">Big Bad Voodoo Daddy</a> performed music for a <b id="mwBGY"><a href="./Phineas_and_Ferb_Christmas_Vacation" id="mwBGc" rel="mw:WikiLink" title="Phineas and Ferb Christmas Vacation">special Christmas episode</a></b> of <i id="mwBGg"><a href="./Phineas_and_Ferb" id="mwBGk" rel="mw:WikiLink" title="Phineas and Ferb">Phineas and Ferb</a></i>?