The song was originally a country music single by singer Wynn Stewart. Although Stewart had previously hit the Top 40 on the Billboard US country chart with songs such as "Wishful Thinking" in 1960, "It's Such a Pretty World Today" was Stewart's highest charting hit, peaking at No. 1 on the country music chart for two weeks in the late spring of 1967. It was released as a single from his album of the same name that year.

Who sang the song it's such a pretty world today? Let's have some stream of consciousness first.
To answer the question, consider the following: The song was originally a country music single by singer Wynn Stewart. So, the answer is singer Wynn Stewart.