Title: Outlander (TV series)
Content:  The music is composed by Bear McCreary. The title song is an adaptation of Robert Louis Stevenson's poem Sing me a Song of a Lad that is Gone, set to the tune of the Scottish folk song "The Skye Boat Song". For the first half of season two, the second verse of the opening theme is sung in French to reflect the season's French setting. For the second half of season three, the second verse of the opening theme has Caribbean music to reflect the season's Jamaican setting. The fourth season opening theme has a colonial American sound.
Title: The Skye Boat Song
Content:  The music can be heard in Season 3, episode 12 of Sex and the City entitled "Don't Ask, Don't Tell" before the first wedding of Charlotte York to Trey McDougal. Bear McCreary adapted the song as the opening titles of the 2014 TV series Outlander, sung by Raya Yarbrough, changing the text of Robert Louis Stevenson's poem "Sing Me a Song of a Lad That Is Gone" (1892) to "Lass" to fit the story. It can also be heard as background instrumental music in several episodes of the American serial killer television series Dexter. Peter Hollens recorded an a capella cover of the song for the 2018 album Legendary Folk songs. It's sung by the character Claire Louise McLeod (played by Lisa Chappell) on season 1, episode 5, "Taking the Reins" of the Australian TV series McLeod's Daughters. The Choral Scholars of University College Dublin recorded an arrangement by their artistic director Desmond Earley for their 2015 album Invisible Stars: Choral Works of Ireland and Scotland
Title: The Skye Boat Song
Content:  [Chorus:] Speed, bonnie boat, like a bird on the wing, Onward! the sailors cry; Carry the lad that's born to be king Over the sea to Skye. 1. Loud the winds howl, loud the waves roar, Thunderclaps rend the air; Baffled, our foes stand by the shore, Follow they will not dare. [Chorus] 2. Many's the lad, fought on that day Well the claymore did wield; When the night came, silently lay Dead on Culloden's field. [Chorus] 3. Though the waves leap, soft shall ye sleep, Ocean's a royal bed. Rocked in the deep, Flora will keep Watch by your weary head. [Chorus] 4. Burned are their homes, exile and death Scatter the loyal men; Yet ere the sword cool in the sheath Charlie will come again.
Title: The Skye Boat Song
Content:  "The Skye Boat Song" is a late 19th-century Scottish song recalling the journey of Prince Charles Edward Stuart (Bonnie Prince Charlie) from Benbecula to the Isle of Skye as he evaded capture by government troops after his defeat at the Battle of Culloden in 1746. Sir Harold Boulton, 2nd Baronet composed the lyrics to an air collected by Anne Campbelle MacLeod in the 1870s, and the line "Over the Sea to Skye" is now a cornerstone of the tourism industry on the Isle of Skye. Alternative lyrics to the tune were written by Robert Louis Stevenson, probably in 1885. After hearing the Jacobite airs sung by a visitor, he judged the words of this song to be "unworthy", so made a new set of verses "more in harmony with the plaintive tune". It is often played as a slow lullaby or waltz, and entered into the modern folk canon in the twentieth century with versions by Paul Robeson, Tom Jones, Rod Stewart, Roger Whittaker, Tori Amos, and many others.
Title: The Skye Boat Song
Content:  Calum Kennedy included a version on Songs of Scotland and Ireland (Beltona 1971), and Rod Stewart recorded two versions of the song with The Atlantic Crossing Drum & Pipe Band during the sessions for Atlantic Crossing between 1974 and 1975. They were given an official release on the deluxe re-release of the album in 2009.
Title: The Skye Boat Song
Content:  The lyrics were written by Sir Harold Boulton, 2nd Baronet, to an air collected in the 1870s by Anne Campbelle MacLeod (1855–1921), who became Lady Wilson by marriage to Sir James Wilson, KSCI (1853–1926), in 1888. The song was first published in Songs of the North by Boulton and MacLeod, London, 1884, a book that went into at least twenty editions. In later editions MacLeod's name was dropped and the ascription "Old Highland rowing measure arranged by Malcolm Lawson" was substituted. It was quickly taken up by other compilers, such as Laura Alexandrine Smith's Music of the Waters (published 1888). Lawson was the elder brother of artist Cecil Gordon Lawson. According to Andrew Kuntz, a collector of folk music lore, MacLeod was on a trip to the isle of Skye and was being rowed over 
Title: The Skye Boat Song
Content:  "The Skye Boat Song" can be heard at the beginning of "Who Stole the Bagpipes", the second episode in season one of the early 1980s British cartoon Dangermouse. Roger Whittaker's duet version with Des O'Connor, released in 1986, made the UK top 10; it combined O'Connor's vocals with Whittaker's whistling version, a part of his repertoire since at least the mid-1970s. The track was recorded at London's Holland Park Lansdowne Studios (now a high-end residential underground property) with session drummer Peter Boita along with all the high-profile studio session players of the day. The cellist Julian Lloyd Webber recorded an instrumental version of the song in 1986 on the album Encore!. In the 1987 horror movie, It's Alive III: Island of the Alive, the main character played by Michael Moriarty sings the song onboard a boat with crew members at 46 mins 17 
Title: The Skye Boat Song
Content:  There has also been a hymn adaptation of the tune, known as "Spirit of God Unseen as the Wind"; some of the lyrics vary. "The Skye Boat Song" has been parodied in song by Dawn French and Jennifer Saunders on their comedy series French and Saunders.
Title: The Skye Boat Song
Content:  Robert Louis Stevenson's 1892 poem, which has been sung to the tune, has the following text: [Chorus:] Sing me a song of a lad that is gone, Say, could that lad be I?Merry of soul he sailed on a day Over the sea to Skye. 1. Mull was astern, Rum on the port, Eigg on the starboard bow; Glory of youth glowed in his soul; Where is that glory now? [Chorus] 2. Give me again all that was there, Give me the sun that shone! Give me the eyes, give me the soul, Give me the lad that's gone! [Chorus] 3. Billow and breeze, islands and seas, Mountains of rain and sun, All that was good, all that was fair, All that was me is gone.
Title: The Skye Boat Song
Content:  Desmond Dupré on guitar and John Sothcott on recorder. It was performed to great acclaim and recorded by artist and social activist Paul Robeson in 1959 and 1960. Welshman Tom Jones recorded a version, which was arranged by Lee Lawson and Harold Boulton, on his debut album Along Came Jones in 1965. The same album, released in the U.S. as It's Not Unusual (and carrying only 12 of the original 16 tracks), did not give attribution for the arrangement but did characterise the song as "Trad.—2:57." Esther & Abi Ofarim recorded the song under the title "Bonnie Boat" for their album Das Neue Esther & Abi Ofarim Album (1966).

Question: who sings the skye boat song on outlander?
Answer: Bear McCreary.
Raya Yarbrough.