The phrase "Where do I begin" is famously known as the opening line of the song "(Where Do I Begin?) Love Story," which is a popular song published in 1970 with music by Francis Lai and lyrics by Carl Sigman

. The song was originally an instrumental theme in the 1970 film Love Story and later had lyrics added after the film's distributor requested a rewrite of the initial lyrics

. The lyrics start with: "Where do I begin
To tell the story of how great a love can be
The sweet love story that is older than the sea
The simple truth about the love she brings to me
Where do I start"

. This song has been famously performed by Andy Williams, whose version reached number nine on the Billboard Hot 100 and number one on the Easy Listening chart

. The song expresses the challenge of starting to tell a profound love story, capturing the emotional depth and timelessness of love. If your query "where do I begin" refers to starting something new or telling a story, this song metaphorically captures that feeling of searching for the right starting point to express something meaningful. If you meant where to begin in a different context, please clarify so I can provide a more specific answer.