When birds appear upon a sing It must be spring And when they sing I know they mean To show it's springtime And when they preen each feather Paving the way with song All the trees get green together Who am I to say they're wrong? The smell of flowers fills the air It must be spring The spell is ours, if you're there It must be springtime In such engaging weather Cupid alone is king I'm so in love It must be spring It must be spring It must be springtime In such engaging weather Cupid alone is king I'm so in love That's why it must be spring