*Pier Angeli's twin sister is actress Marisa Pavan.
Pier Angeli's first American film, Teresa (MGM 1951) won her a Golden Globe as best newcomer (New Star Of The Year) but she didn't really live up to these expectations in the films that followed. In 1956 she starred in Somebody Up There Likes Me alongside Paul Newman in a role originally intended for James Dean, but he was dead by then.
1960's Films didn't bring her much success but just when things started to look up for Pier Angeli when she was offered a role in The Godfather, tragedy struck and she died at 39 of an medical incident. Speculations about suicide have never been confirmed.
Pier Angeli recorded Volare for her 1959 LP Italia Con Pier Angeli (Forum SF 9055, re-issued on Roulette SR 25051) which is now a collectable LP. Volare was also released as a b-side to Torero (Roulette 4104) The EP Italia Con Pier Angeli features 4 tracks of the LP but not Volare.
The LP was re-issued on CD in Japan in 2005 (EMI), I don't know of any other CD-issues.
** Vic Damone recorded at least two Eurovision songs, both Italian entries. Al Di La from 1961 (on CD Feelings, 1993) and Dio Come Ti Amo (1966) on the CD Greatest songs of the 20st century.
With this link you'll get all the Eurocovers posts that have featured (or mentioned) the song so far.