Question: What role in their respective bands links Brent Smith and Mike Score?

Context paragraphs:
Not Strong Enough (Apocalyptica song): "Not Strong Enough" is a song by Finnish rock band Apocalyptica.  The song is the third single from their seventh studio album "7th Symphony".  The song features Brent Smith of Shinedown on lead vocals.  It was first released on iTunes on November 1, 2010, but not in the US, where another version of the song, featuring Doug Robb of Hoobastank on vocals, was released on January 18, 2011.  The song was re-recorded with Robb after the band failed to secure the rights to release the song in the US with Smith's vocals from Shinedown's label, Atlantic Records.

Army of Anyone: Army of Anyone was a rock supergroup formed by Filter frontman Richard Patrick with two members of rock band Stone Temple Pilots.  In addition to Patrick on vocals, the band featured brothers Dean DeLeo and Robert DeLeo on guitar and bass respectively, and Ray Luzier, formerly of David Lee Roth's band, on drums.  The band released one self-titled album in November 2006, which was well-received, but sold well short of the member's multi-platinum selling releases of their other bands.  After touring in support of the album, the band went into hiatus in mid-2007, with members returning to their respective bands, except Luzier, who joined Korn.  Despite being relatively inactive since 2007, all members have stayed in contact, and have independently shown interest in working on a second album if the logistics and scheduling of their commitments to other bands ever aligned.

The Cancer Conspiracy: The Cancer Conspiracy was a progressive rock group from Burlington, Vermont featuring guitarist Daryl Rabidoux, drummer/keyboardist/saxophonist Greg Beadle, and bassist Brent Frattini.  Rabidoux and Beadle were veterans of the local hardcore scene, and had broken away from their respective bands out of a need to try something new musically.  Their initial plans were to find a vocalist and bassist, but after recruiting Frattini, decided to remain an instrumental trio.

Modern Love Is Automatic: "Modern Love is Automatic" is a 1982 song by the group A Flock of Seagulls, written by Mike Score, Ali Score, Frank Maudsley and Paul Reynolds, and first showcased on the album of the same name.  It was the fourth single off the album.  Originally, it was a 1981 EP, later re-edited and mixed onto the "A Flock of Seagulls" album.

Shinedown: Shinedown is an American rock band from Jacksonville, Florida.  Formed by Brent Smith in 2001 after the dissolution of his prior band, Smith, still under contract with record label Atlantic Records, recruited the band's original lineup of Jasin Todd as guitarist, Brad Stewart on bass, and Barry Kerch on drums.  Consistent for the first two album cycles, a few lineup changes followed in the late 2000s, eventually stabilizing with Smith and Kerch, as remaining members alongside newcomers Zach Myers on guitar, and Eric Bass on bass.  The group has released five studio albums: "Leave a Whisper" (2003), "Us and Them" (2005), "The Sound of Madness" (2008), "Amaryllis" (2012), and "Threat to Survival" (2015).  Shinedown has sold more than ten million records worldwide, and has had 11 number one singles on the "Billboard" Mainstream Rock charts, the third most of all-time, behind Van Halen and Three Days Grace.

Mike Score: Michael Gordon "Mike" Score (born 5 November 1957) is an English musician.  He is best known as the keyboardist, guitarist and lead singer of the new wave band, A Flock of Seagulls.  He released a solo album on 1 March 2014 titled "Zeebratta".

Devour (song): "Devour" is a song by American rock band Shinedown.  The song was released as the first single in promotion of the band's third studio album, "The Sound of Madness".  The track landed online and at multi-format rock radio outlets nationwide on May 5.  As has been the case with other new singles by bands such as Disturbed, Theory of a Deadman, and Seether, "Devour" is so far Shinedown's fastest rising single to date, reaching the top five of the "Billboard" Hot Mainstream Rock Tracks chart in four weeks.  In a No. 1 countdown interview, vocalist Brent Smith said that the single was "a letter to the President," and that it is about Smith's distaste towards George W. Bush.  It is their second No. 1 song on the Hot Mainstream Rock Tracks chart.

Zeebratta: Zeebratta is the debut album of Mike Score, the lead singer of A Flock of Seagulls.  It was released on digital download on March 1, 2014, and will be later be released on physical copies.  Two singles were released from the album, "All I Wanna Do" and "Somebody Like You".

Blue Sunshine (album): Blue Sunshine is the only album by the British supergroup the Glove, released in 1983 by Wonderland Records/Polydor.  This album mainly served as a diversion for Robert Smith and Steven Severin when both of them were under heavy stress in their respective bands the Cure and Siouxsie and the Banshees.  Since Smith was prohibited from singing in another band by his record company, he and Severin recruited Zoo dancer Jeanette Landray (a former girlfriend of Banshees drummer Budgie) to sing the majority of the tracks on the original release; Smith only sang on "Mr. Alphabet Says" and "Perfect Murder".  Other musicians involved in this project were Andy Anderson (who later joined the Cure), Martin McCarrick (who later joined the Banshees), Ginny Hewes and Anne Stephenson.

Brent Smith: Brent Stephen Smith (born January 10, 1978), known professionally as Brent Smith, is an American singer, songwriter, and musician best known as the lead vocalist of the band Shinedown.

Supporting paragraphs: Brent Smith Mike Score
Answer: lead vocalist