Question: Which band My Darkest Days or Human Drama had only one constant member?

Passages:
Culture are a Jamaican roots reggae group founded in 1976.  Originally they were known as the African Disciples.  The one constant member until his death in 2006 was Joseph Hill. Human is the fifth studio album by Canadian rock band Three Days Grace.  The album was released on March 31, 2015 through RCA Records.  This is the group's first album without original lead singer Adam Gontier, and the first with former My Darkest Days lead singer Matt Walst.  It debuted at No. 16 on the ""Billboard" 200. Matt's Mood is the 2004 "temporary comeback" album by UK outfit Matt Bianco, released for Universal, and distributed by the Emarcy label.  The album makes heavy use of Danny White and Basia Trzetrzelewska's signature harmonies.  The two rejoined the band after twenty years (only to leave shortly after the end of the promotional world tour to revitalise their own career under the joint name of Basia).  The third member on this installation of Matt Bianco is vocalist and composer Mark Reilly, whom many identify as the face of the band, being the only one constant member since its inception in 1983.  This album attempted to sound similar to "Whose Side Are You On? ", which spawned a number of popular hit singles in the 1980s. Bigbang is a Norwegian rock band led by frontman Øystein Greni.  Over several years the band lineup has altered several times while remaining a trio, with Greni remaining the one constant member.  Though the band name spelling is inconsistent, it is usually styled BigBang. Hijōkaidan (非常階段 , emergency staircase) is a Japanese noise and free improvisation group with a revolving lineup that has ranged from two members to as many as fourteen in its early days.  The group is the project of guitarist Jojo Hiroshige (JOJO広重 ) , its one constant member, who is head and owner of the Osaka-based Alchemy Records.  Other regulars include Jojo's wife Junko and Toshiji Mikawa (also of Incapacitants). My Darkest Days is the debut album by Canadian rock band My Darkest Days, released on September 21, 2010.  The album has sold more than 100,000 copies in the US and more than 20,000 in Canada.  The first single, "Porn Star Dancing", peaked at number seven on "Billboard"' s Rock Songs chart Human Drama is an American alternative rock band led by singer/songwriter Johnny Indovina formed in 1985.  With Indovina the only constant member, the band released six studio albums before splitting in 2005.  They reformed for concerts in 2011 and 2012, and again in 2015.  In 2017 they released their 1st studio album in 15 years "Broken Songs for Broken People". My Darkest Days were a Canadian rock band based in Peterborough, Ontario consisting of lead singer Matt Walst, bassist Brendan McMillan, drummer Doug Oliver, and keyboardist Reid Henry.  They were discovered by Chad Kroeger of Nickelback, who signed them to his record label, 604 Records. Human Drama The Best of Human Drama...In a Perfect World was released by Triple X in 2000. Human Drama Human Drama was released by Projekt Records in 1994.

Supporting sentences:
My Darkest Days were a Canadian rock band based in Peterborough, Ontario consisting of lead singer Matt Walst, bassist Brendan McMillan, drummer Doug Oliver, and keyboardist Reid Henry. Human Drama is an American alternative rock band led by singer/songwriter Johnny Indovina formed in 1985.  With Indovina the only constant member, the band released six studio albums before splitting in 2005.