Sanctus by Libera, a boys' choir.

They can sooth and enliven me at the same time. So amazing how high those boy choristers can go.

batty*, bizarre, bonkers, cracked*, crackers, crazed, crazy, cuckoo*, daft, demented, derailed, deranged, fatuous, frenzied, gone, half-cocked, idiotic, impractical, irrational, irresponsible, loony*, lunatic, mad, maniacal, mental, moonstruck*, nuts*, nutty*, paranoid, preposterous, psychopathic, psychotic, rabid, raging, raving, schizo, schizophrenic, screwy, senseless, stupid, touched, unglued, unhinged, unsettled, unzipped, whacko, wild