Question: Which singer, Jesse James Dupree or Jack Russell, is primary songwriter in the rock band Jacky?

Context paragraphs:
Liberty N' Justice: Liberty N' Justice (LNJ) is a Christian hard rock band started in 1991 by Justin Murr and Patrick Marchand with band mates: Robert Earl Sliger; Angie Beckett; Kim; and James Beckett.  In 2002, Murr continued with the Liberty N' Justice name, contacting several well-known artists to join him in creating the new album "Welcome to the Revolution".  They have continued through the past two decades, collaborating with such special guest vocalists such as: Lou Gramm of Foreigner, Chris Jericho of Fozzy, Phil Collen of Def Leppard, Sebastian Bach, Leif Garrett, Michael Sweet of Stryper, C J Snare of Firehouse, Rubicon Cross, Jack Russell of Great White, Kip Winger of Winger, and various others.

Rising (Great White album): Rising is the eleventh studio album by the American hard rock band Great White, released in 2009.  It was recorded in the winter of 2008 with completion in early 2009.  "Rising" was mixed, produced, and engineered by Michael Lardie with all members of the group contributing to the final mix.  This is the final album with long-time singer Jack Russell before the split that led to the creation of his own-fronted version of the band.

Jack Russell (musician): Jack Russell (born December 5, 1960), is an American rock vocalist.  He is a founding member of the American hard rock band Great White.

Jackyl: Jackyl is an American hard rock band formed in 1991.  Their sound has also been described as heavy metal and Southern metal.  Their eponymous album has sold more than a million copies in the United States with released hit singles like "Down on Me" and "When Will it Rain".  The band is best known for its song "The Lumberjack", which features a chainsaw solo by lead singer Jesse James Dupree.

Dario Seixas: Dario Seixas Filho (born March 11, 1971) is a rock bass player, who most recently played with the multi-platinum band Jack Russell's Great White.  He has also toured with the hard rock band Firehouse and recorded their 2003 release Prime Time.  He has been credited by the Brazilian media as the first Brazilian musician to play in a top hard rock band.  Seixas has also toured with metal legend Stephen Pearcy of RATT, and is a current member of the bands Goodbye Thrill and Crown of Thorns.  His stage presence and bass tricks have earned him the reputation of a "not to miss" performer.

Foot Fetish: Foot Fetish is the first solo studio album by the Jackyl's lead singer, Jesse James Dupree.

Jesse James Dupree: Jesse James Dupree (born September 22, 1962) is an American musician, television personality, and businessman.  Dupree is the lead singer, guitarist, and primary songwriter in the rock band Jackyl, founded in 1991.

Nigel Dupree Band: Nigel Dupree Band is a southern rock band from Kennesaw, Georgia started by Nigel Thomas Dupree, the son of Jackyl lead vocalist Jesse James Dupree.  Having performed at events such as Full Throttle Saloon, Rocklahoma and Taste of Madison, the band has released two studio albums, "Attraction" and "Up to No Good".

Roman Glick: Roman Glick is an American bassist.  He is known for playing with Brother Cane, Slave to the System, Jesse James Dupree, and Jackyl.

Thank You...Goodnight!: Thank You...Goodnight!  is a live album released by the American hard rock band Great White in 2002.  The album has the subtitle 'The Farewell Concert', because it contains the final performance of the band before disbandment, as announced by singer Jack Russell in November 2001.  The concert was held at The Galaxy Theatre in Santa Ana, California, on 31 December 2001 and for the occasion original guitarist Mark Kendall and Sean McNabb rejoined the band.  Russell and Kendall were anyway on the road again under the name 'Jack Russell's Great White' already in 2002.  Two new songs, "Back to the Rhythm" and "Play On", are recorded on this album for the first time and reappeared in 2007 on the album "Back to the Rhythm".

Supporting paragraphs: Jesse James Dupree Jack Russell (musician)
Answer: Jesse James Dupree