Alicia Keys’ “Diary” (2004) is a sultry neo-soul ballad that invites the listener into an intimate confession. Built on gentle piano chords and lush R&B harmonies (featuring Tony! Toni! Toné!), the song uses a diary metaphor to pledge trust and secrecy in love. Not as commercially big as some of Keys’s hits, “Diary” still became a fan favorite, showcasing her smoky vocals and heartfelt songwriting.