[Verse 1] When development goes wrong from the start The aorticopulmonary septum never forms apart No division between the vessels two Just one big trunk for blood to travel through The truncus stands alone and wide Straddling both ventricles side by side Systemic, pulmonary, coronary flow All from one vessel, high and low [Chorus] Never formed, never came down The septum that should divide is nowhere to be found One trunk, two hearts, blood mixing free VSD below for all to see Never formed, that's the key Truncus arteriosus type II [Verse 2] The conotruncal septum should descend To close the upper gap and bring division's end But when it fails to make its way A ventricular septal defect stays Blood from left and right ventricles blend Through the opening that will never mend Into the truncus they both pour Mixed blood flowing evermore [Chorus] Never formed, never came down The septum that should divide is nowhere to be found One trunk, two hearts, blood mixing free VSD below for all to see Never formed, that's the key Truncus arteriosus type II [Bridge] Two vessels should have been the plan Aorta and pulmonary, separate they should stand But nature's blueprint went astray Left us with one trunk today Always a VSD you'll find The conotruncal gap left behind Single vessel, double load Carrying blood down every road [Chorus] Never formed, never came down The septum that should divide is nowhere to be found One trunk, two hearts, blood mixing free VSD below for all to see Never formed, that's the key Truncus arteriosus type II [Outro] Remember this fundamental flaw The septum that development never saw Never formed, never there One trunk for all the blood to share
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