"Sentinel" is a single

Single (music)

In music, a single or record single is a type of release, typically a recording of fewer tracks than an LP or a CD. This can be released for sale to the public in a variety of different formats. In most cases, the single is a song that is released separately from an album, but it can still appear...

 by musician Mike Oldfield

Mike Oldfield

Michael Gordon Oldfield is an English multi-instrumentalist musician and composer, working a style that blends progressive rock, folk, ethnic or world music, classical music, electronic music, New Age, and more recently, dance. His music is often elaborate and complex in nature...

, released in 1992. The single features a restructured, shorter version of "Sentinel", from the album Tubular Bells II

Tubular Bells II

Tubular Bells II is the 15th music album by Mike Oldfield, released in 1992. The album - the first for his new record label, Warner Bros. Records, following an acrimonious departure from Virgin Records after twenty years - was conceived as a sequel to Oldfield's 1973 Tubular Bells...

.

Charts

It charted at number 10 in the UK Singles Chart

UK Singles Chart

The UK Singles Chart is compiled by The Official Charts Company on behalf of the British record-industry. The full chart contains the top selling 200 singles in the United Kingdom based upon combined record sales and download numbers, though some media outlets only list the Top 40 or the Top 75 ...

 and at number 14 in the Irish Singles Chart

Irish Singles Chart

The Irish Singles Chart is Ireland's music industry standard singles popularity chart issued weekly by the Irish Recorded Music Association and compiled on behalf of the IRMA by Chart-Track. Chart rankings are based on sales, which are compiled through over-the-counter retail data captured...

.

Chart (1992)	Position
UK Singles Chart UK Singles Chart The UK Singles Chart is compiled by The Official Charts Company on behalf of the British record-industry. The full chart contains the top selling 200 singles in the United Kingdom based upon combined record sales and download numbers, though some media outlets only list the Top 40 or the Top 75 ...	10
Irish Singles Chart Irish Singles Chart The Irish Singles Chart is Ireland's music industry standard singles popularity chart issued weekly by the Irish Recorded Music Association and compiled on behalf of the IRMA by Chart-Track. Chart rankings are based on sales, which are compiled through over-the-counter retail data captured...	14

Usage

An excerpt was used in the soundtrack for the "Back from the Dead" television programme, broadcast by the BBC

BBC

The British Broadcasting Corporation is a British public service broadcaster. Its headquarters is at Broadcasting House in the City of Westminster, London. It is the largest broadcaster in the world, with about 23,000 staff...

 in 2010 as part of its Horizon series of documentaries.

UK single

1. "Sentinel" (Single Restructure) (Mike Oldfield) – 3:57
2. "Sentinel" (the orb 7" mix) – 4:07
3. "Early Stages" – 4:08

UK promo single

1. "Sentinel-Restructure" (Satoshi Tomiie Interpretation) - 7:41
2. "Sentinel-Restructure" (Global Lust Mix) - 5:55
3. "Sentinel-Restructure" (Trance Mix) - 5:52
4. "Sentinel-Restructure" (Tubular Beats) - 4:12

Oldfield vs. The Orb

"Sentinel" was also released as a remix single, credited to Oldfield Vs. The Orb

The Orb

Throughout 1989, the Orb, along with Martin Glover, developed the musical genre of ambient house through the use of a diverse array of samples and recordings. The culmination of its musical work came toward the end of the year when the group recorded a session for John Peel on BBC Radio 1...

. It was released on September 28, 1992.

"Sentinel Total Overhaul" track listing

1. "Sentinel" (nobel prize mix) – 14:26
2. "Sentinel" (orbular bells mix) – 12:26
3. "Sentinel" (the orb 7" mix) – 4:03