"Heavy" is the first single of Lauri Ylönen from his first solo album "New World".
 The world premiere of the song was on 26 February 2011 with a digital release on 25 February.
Lauri Ylönen (born 23 April 1979) is a Finnish singer-songwriter, best known as the frontman of the Finnish alternative rock band The Rasmus.
"Keep Your Heart Broken" is a song by the Finnish alternative rock band The Rasmus, and the ninth track of their 2005 album "Hide from the Sun".
 It was written by lead-singer Lauri Ylönen.
"Bittersweet" is a single by the cello rock band Apocalyptica in collaboration with Ville Valo (of HIM) and Lauri Ylönen (of The Rasmus).
 The music is by Apocalyptica, the lyrics by Ville Valo and the vocals by Ville Valo and Lauri Ylönen.
 The song is written for four cellos (quartet) and voice, but there are versions for just the cello quartet.
 The lyrics are about a love triangle, in which a woman loves a man, who does not love her back, and another man which is in love with the woman, while she does not love him back.
The Rasmus are a Finnish rock band that formed in 1994 in Helsinki while the band members were still in upper comprehensive school.
 The original band members were Lauri Ylönen (lead singer/songwriter), Eero Heinonen (bass), Pauli Rantasalmi (guitar) and Jarno Lahti (drums).
 Jarno Lahti left the year after and was replaced by Janne Heiskanen in 1995.
 Heiskanen quit the band in 1998 and was soon replaced by Aki Hakala.
 The Rasmus has sold 4 million albums worldwide, 310,000 copies in their native Finland alone.
 They have won numerous awards, both domestic and international.
Samuel Bingham "Sam" Endicott (born August 13, 1974) is an American songwriter, multi-instrumentalist, actor and director.
 He is best known as the lead vocalist of the Bravery, with whom he recorded three studio albums.
 He is currently the lead singer of The Mercy Beat.
"Sail Away" is a song by the Finnish rock band The Rasmus, originally released on the band's sixth studio album "Hide from the Sun" on September 2, 2005.
 The song was written by the lead singer Lauri Ylönen.
 Sail away was 2nd on the United States singles list in 2005.
New World is the first solo album from Lauri Ylönen, lead singer of Finnish band The Rasmus.
 The album was released on 30 March 2011.
 This album contains songs by Lauri that didn't fit The Rasmus' style, and decided to be released as a solo album.
 The first single released was "Heavy" and the second was "In the City".
"Ghost of Love" is a radio single released exclusively in Finland by Finnish alternative rock band The Rasmus, and the third track on their 2008 studio album "Black Roses".
 It was written by lead-singer Lauri Ylönen.
Brian Joseph Karscig is a musician, songwriter, and record producer, but is mostly recognized as the co-singer/guitarist/songwriter for the American Rock and Roll Band Louis XIV signed to Atlantic Records.
 He also is the singer/guitarist/songwriter of American Rock Band The Nervous Wreckords.
 Karscig owns Nervous Productions, and co-owner of "The Pineapple Recording Group", and has produced records for artists such as Anya Marina (Slow and Steady Seduction: Phase II) for Chopshop/Atlantic Records, The Silent Comedy, Transfer, Les Gars, Apes of Wrath, Republic of Letters, and Subsurfer.
 Aside from his songwriting with LOUIS XIV, and The Nervous Wreckords, Karscig is also known for his co-writes with Brandon Flowers of The Killers ("Thief in the Choir" and "Turn the Light On"), and Sam Endicott of The Bravery ("Send it in a Letter"), as well as Anya Marina ("Afterparty at Jimmy's) and A.J. Croce's 2013 single "Keep the Change".
 Karscig is also credited with additional vocals on The Killers 2006 release "Sam's Town".
 Most recently Karscig toured South America as the piano/guitar player for Brandon Flowers "Desired Effect" Tour, and also joined The Killers as 2nd guitar player for their 2016 US/Canada tour.
 Although The Nervous Wreckords was Karscig's solo effort after Louis XIV, Karscig started his first solo record under his birth name Brian Karscig due out early 2017.

Question: What songwriter is younger, Lauri Ylönen or Sam Endicott?
Answer: Lauri Ylönen