Question: What occupation do Tim Armstrong and Walt Aldridge share in common?
Context: Transplants are an American punk rock/rap rock supergroup.  They formed in 1999 when Tim Armstrong (of the bands Rancid and Operation Ivy) played his friend and roadie Rob Aston some beats he had made using Pro Tools and asked Aston if he would consider contributing lyrics.  Initially, Armstrong played all the instruments himself but as the project grew, he invited musician friends such as Matt Freeman (Rancid), Lars Frederiksen (Rancid), and Vic Ruggiero (The Slackers) to add to the sound.  Before long, Armstrong and Aston decided to officially form a band, but to make things complete, they wanted a drummer, so Travis Barker from Blink-182 was asked to join in 2002. Save the Last Chance is a song written by Walt Aldridge and Robert Byrne, and recorded by American country music artist Johnny Lee.  It was released in April 1985 as the lead single from the album "Keep Me Hangin' On".  The song reached number 12 on the "Billboard" Hot Country Singles & Tracks chart and number 12 on the Canadian "RPM" Country Tracks chart. "I Am a Simple Man" is a song written by Walt Aldridge, and recorded by American country music artist Ricky Van Shelton.  It was released in April 1991 as the first single from his album "Backroads".  The song was Ricky Van Shelton's 8th number 1 hit on the "Billboard" Hot Country Singles & Tracks (now Hot Country Songs) chart. The Stories Are True is a debut full-length album by the street punk band Time Again.  It was released on April 25, 2006 on Tim Armstrong's label Hellcat Records.  Tim Armstrong is also featured on the title track "The Stories Are True". "Like There Ain't No Yesterday" is a song recorded by American country music band Blackhawk.  It was released in November 1995 as the second single from their album "Strong Enough".  It peaked at number 3 on the United States "Billboard" Hot Country Singles & Tracks, while it was their second number-one hit in Canada.  The song was written by Walt Aldridge and Mark Narmore. James Walton "Walt" Aldridge, Jr. (born November 12, 1955 in Florence, Alabama) is an American musician, singer, songwriter, engineer and record producer. "Modern Day Bonnie and Clyde" is a song written by Walt Aldridge and James LeBlanc, and recorded by American country music artist Travis Tritt.  It was released in January 2002 as the fourth and final single from his album "Down the Road I Go".  It peaked at number 8, and is his last top ten hit to date. The Shooters was a five-piece country music band founded in Muscle Shoals, Alabama.  It consisted of Walt Aldridge (guitar, lead vocals) Gary Baker (bass guitar), Barry Billings (guitar), Chalmers Davis (keyboards), and Michael Dillon (drums).  They charted several times on the "Billboard" country charts between 1986 and 1989.  The quintet's first four singles were to have been included on an album titled "Going Against the Wind".  1989's "Solid as a Rock" included their highest-charting single, the number 13 "Borderline". "Some Things Never Change" is a song written by Walt Aldridge and Brad Crisler, and performed by American country music artist Tim McGraw.  It was released in April 2000 as the fourth single from his album "A Place in the Sun".  While it went to number 1 in Canada, it peaked only at number 7 in the US, and was the only single from the album not to reach number 1 in the US.  It also peaked at number 58 on the Billboard Hot 100. Timothy Ross “Tim” Armstrong (born on November 25, 1965) is an American musician, singer, songwriter, producer, and actor.  He is best known as the singer/guitarist for the punk rock band Rancid and hip hop/punk rock supergroup the Transplants.  Prior to forming Rancid, Armstrong was in the influential ska punk band Operation Ivy.  In 1997, along with Brett Gurewitz of the band Bad Religion and owner of Epitaph Records, Armstrong founded Hellcat Records.  In 2012, through his website, Armstrong started releasing music that influenced him, along with stripped-down cover songs of his own work under the name Tim Timebomb.  He has released at least one song per week since late 2012.  Armstrong is also a songwriter for other artists.  Armstrong won a Grammy Award for his work with Jimmy Cliff and Pink and he has also worked with Joe Walsh.
Answer: musician