"Monday, Monday" is a song by the American band The Mamas & the Papas, released in 1966. It became one of their most popular hits, reaching number one on the Billboard Hot 100 chart. The song reflects the feelings of uncertainty and longing that often accompany the start of a new week. The lyrics express a mix of emotions, highlighting the challenges and hopes that come with Mondays. The catchy melody and harmonious vocals contributed to its lasting appeal, making it a classic in the folk rock genre. The song remains a nostalgic reminder of the complexities of everyday life.