Question: Who was lead singer, rhythm guitarist and harmonica player for the group Trick Pony, Kevin Parker or Heidi Newfield ?

Context paragraphs:
Trick Pony (album): Trick Pony is the debut studio album from the American country music group Trick Pony, released in 2001 on Warner Bros.  Records Nashville.  The album produced three singles in "Pour Me", "On a Night Like This", and "Just What I Do", which respectively reached #12, #4, and #13 on the "Billboard" Hot Country Singles & Tracks (now Hot Country Songs) charts.  "Just What I Do" was nominated for the 2003 Grammy Awards for "Best Country Performance By A Duo Or Group With Vocals".  Also included is a cover of Johnny Cash's "Big River", here covered with Cash and Waylon Jennings.

What Am I Waiting For: What Am I Waiting For is the debut solo album from American country music singer Heidi Newfield, formerly the lead vocalist in the group Trick Pony.  It was released on August 5, 2008 on Curb Records and produced by Tony Brown.  The album's lead-off single, "Johnny & June", peaked at number 11 on the Hot Country Songs charts.  This song was followed by "Cry, Cry ('Til the Sun Shines)", which peaked at number 29.  "What Am I Waiting For" debuted on the "Billboard" 200 at number 10 with 34,000 copies sold in its first week.

On a Night like This (Trick Pony song): "On a Night Like This" is a song written by Doug Kahan and Karen Staley, and recorded by American country music group Trick Pony.  It was released in April 2001 as the second single from the album "Trick Pony".  The song reached number 4 on the "Billboard" Hot Country Singles & Tracks chart and number 47 on the Billboard Hot 100.

Burns &amp; Poe: Burns & Poe was an American country music duo composed of Keith Burns and Michelle Poe.  The duo was founded in 2007 after Burns left the group Trick Pony.  Poe was once a solo artist for DreamWorks Nashville, and later played bass guitar for Dierks Bentley and Hank Williams, Jr. The two met in 2007 while Burns was holding auditions to recruit a new lead singer for Trick Pony after Aubrey Collins (who had replaced original lead singer Heidi Newfield just months earlier) left.

Just What I Do: "Just What I Do" is a song recorded by American country music group Trick Pony.  It was released in January 2002 as the third single from their debut album "Trick Pony".  The song was written by group members Keith Burns and Ira Dean, with Burns taking lead vocals.

Heidi Newfield: Heidi Newfield (born October 4, 1970) is an American country music artist.  She was lead singer, rhythm guitarist and harmonica player for the group Trick Pony, alongside Keith Burns and Ira Dean from 1996 until 2006, when she left in pursuit of a solo career.  Newfield has begun her solo career on Curb Records, debuting in 2008 with the single, "Johnny & June."  This song, which peaked at No. 11 on the Hot Country Songs charts, is the first release from her solo debut album, "What Am I Waiting For", which has produced a second Top 30 country hit, "Cry Cry ('Til the Sun Shines)."

Pour Me (Trick Pony song): "Pour Me" is a debut song recorded by American country music group Trick Pony.  It was released in October 2000 as the first single from their debut album "Trick Pony".  The song was written by group members Keith Burns, Ira Dean and Heidi Newfield with Rory Waters Beighley and Sammy Harp Wedlock.

Trick Pony: Trick Pony is an American country music group, formed in 1996 by Heidi Newfield (lead vocals, acoustic guitar, harmonica), Keith Burns (lead guitar, vocals), and Ira Dean (bass guitar, upright bass, vocals).  They recorded three studio albums: "Trick Pony", "On a Mission", and "R.I.D.E.", released in 2001, 2002, and 2005.  These albums produced eight singles on the "Billboard" Hot Country Songs chart, including four Top 20 hits: "Pour Me", "On a Night like This", "Just What I Do", and "On a Mission".

Johnny &amp; June (song): "Johnny & June" is the solo debut song co-written and recorded by American country music singer Heidi Newfield, the former lead singer of the group Trick Pony.  It was released in March 2008 as the first single from her debut album "What Am I Waiting For", which was released in August 2008 on Curb Records.  The song reached a peak of #11 on the Hot Country Songs charts in late September 2008.

Kevin Parker (musician): Kevin Richard Parker (born 20 January 1986) is an Australian singer, songwriter, multi-instrumentalist and record producer, best known for being the frontman and live guitarist of the Australian psychedelic rock band Tame Impala, for which he writes, records, and produces the music.  At the ARIA Music Awards of 2015 he won two awards, Engineer of the Year and Producer of the Year, for his work on Tame Impala's "Currents" (2015).

Supporting paragraphs: Heidi Newfield Kevin Parker (musician)
Answer: Heidi Newfield