“Beautiful Day” is played at a tempo of 136 beats per minute in a 4/4 time signature. The song opens with a reverberating electric piano playing over a string synthesiser, introducing the chord progression of A–Bm7–D–G–D9–A. This progression continues throughout the verses and chorus, the changes not always one to a bar. After the opening line, “The heart is a bloom”, the rhythm enters, comprising repeated eighth notes on bass guitar and a drum machine. In the first verse, Bono’s vocals are in the front in the mix and their production is dry. At 0:29, a guitar arpeggio pattern by the Edge first appears, echoing across channels. The verses are relatively quiet until the chorus, when the Edge begins playing the song’s guitar riff and Mullen’s drums enter. During the chorus, Bono sings in a restrained manner, contrasting with the Edge’s “loud, bellowing” background vocals, a sustained cry of “day”.