"E.O.I.O" (aka "Eeo-Eio" and "Io... Aio") is a song written by Lynsey de Paul (credited as Rubin) and Edward Adamberry, and published by Chappell.^[1] It was originally released as a single by the group the Beads, on the Decca label in October 1971.^[2][3][4] This was one of the earliest records produced by Peter Collins; he also wrote the B-side "Sweetie Peetie". The single was released in the UK and most territories in Europe, as well as Turkey (with a picture sleeve)^[5] and Lebanon.^[6]

The actor and singer Jack Wild recorded his version of "E.O.I.O.", produced by Biddu,^[7] for his 1972 album A Beautiful World.^[8] It was released on Buddah Records in the US^[9][10][11] and received positive reviews from Billboard^[12] and "High Fidelity Magazine".^[13] Although the vinyl album version lists the song as "E.O.I.O.", the eight-track cartridge release lists the song as "Eeo-Eio" and features it twice.^[14] The song also appeared as a track on his 1972 Japanese album, Punch And Judy.^[15] Writing for "Do You Remember", Dana Daly mentions "E.O.I.O." as the stand out track from Beautiful World album.^[16] The song is still played on American radio.^[17]

A version of the song with Italian lyrics by Dino Sarti^[18][19] called "Io... Aio" was also released by the Italian group, Domodossola (also known as "I Domodossola"), a vocal and instrumental ensemble named after their birthplace,^[20] on their first album D... Come Domodossola in 1971.^{[21][22][23][24][25]} The group was championed by Mina and the album was released on her PDU record label (distributed by EMI).^[26]