Question: What position did Melvin George Schacher play in the American rock band popular during the 1970s?

Context paragraphs:
The Four Seasons (band): The Four Seasons is an American rock and pop band that became internationally successful in the 1960s and 1970s.  The Vocal Group Hall of Fame has stated that the group was the most popular rock band before the Beatles.  Since 1970, they have also been known at times as Frankie Valli and the Four Seasons.  In 1960, the group known as the Four Lovers evolved into the Four Seasons, with Frankie Valli as the lead singer, Bob Gaudio (formerly of the Royal Teens) on keyboards and tenor vocals, Tommy DeVito on lead guitar and baritone vocals, and Nick Massi on electric bass and bass vocals.

Lynyrd Skynyrd: Lynyrd Skynyrd (pronounced ) is an American rock band best known for popularizing the Southern rock genre during the 1970s.  Originally formed in 1964 as "My Backyard" in Jacksonville, Florida, the band was also known by names such as "The Noble Five" and "One Percent", before finally deciding on "Lynyrd Skynyrd" in 1969.  The band gained worldwide recognition for its live performances and signature songs "Sweet Home Alabama" and "Free Bird".  At the peak of their success, two band members and a backup singer died in an airplane crash in 1977, putting an abrupt end to the band's most popular incarnation.  The band has sold 28 million records in the United States.

Chicago (band): Chicago is an American rock band formed in 1967 in Chicago, Illinois.  The self-described "rock and roll band with horns" began as a politically charged, sometimes experimental, rock band and later moved to a predominantly softer sound, generating several hit ballads.  The group had a steady stream of hits throughout the 1970s and 1980s.  Since at least 2008, "Billboard" has shown Chicago to be the "greatest of all time" American band in singles chart success, and since 2015, the "greatest of all time" American band in album chart success as well.  Chicago is one of the longest-running and most successful rock groups, and one of the world's best-selling groups of all time, having sold more than 100 million records.

Mel Schacher: Melvin George "Mel" Schacher (born April 8, 1951) is best known as the bassist for rock band Grand Funk Railroad.

Kansas (band): Kansas is an American rock band that became popular in the 1970s initially on album-oriented rock charts and later with hit singles such as "Carry On Wayward Son" and "Dust in the Wind".  The band has produced eight gold albums, three multi-platinum albums ("Leftoverture", "Point of Know Return", "The Best of Kansas"), one platinum live album ("Two for the Show") and a million-selling single, "Dust in the Wind".  Kansas appeared on the "Billboard" charts for over 200 weeks throughout the 1970s and 1980s and played to sold-out arenas and stadiums throughout North America, Europe and Japan.  "Carry On Wayward Son" was the second-most-played track on US classic rock radio in 1995 and No. 1 in 1997.

Melvins: The Melvins are an American rock band that formed in 1983 in Montesano, Washington.  They have mostly performed as a trio, as well as a quartet with two drummers in recent years.  Since 1984, vocalist and guitarist Buzz Osborne and drummer Dale Crover have been constant members.  The band was named after a supervisor at a Thriftway in Montesano, Washington, where Osborne also worked as a clerk.  "Melvin" was despised by other employees, and the band's members felt it to be an appropriately ridiculous name.  Their early work was key to the development of both grunge and sludge metal.

Grand Funk Railroad: Grand Funk Railroad, sometimes shortened as Grand Funk, is an American rock band popular during the 1970s, when they toured extensively and played to packed arenas worldwide.  David Fricke of "Rolling Stone" magazine once said, "You cannot talk about rock in the 1970s without talking about Grand Funk Railroad!"  Known for their crowd-pleasing arena rock style, the band was well-regarded by audiences despite a relative lack of critical acclaim.  The band's name is a play on words of the Grand Trunk Western Railroad, a line that ran through the band's home town of Flint, Michigan.

NOFX: NOFX is an American punk rock band from Los Angeles, California.  They were formed in 1983 by vocalist/bassist Fat Mike and guitarist Eric Melvin.  Drummer Erik Sandin joined NOFX shortly after, and El Hefe joined the band in 1991 to play lead guitar and trumpet, rounding out the current line-up.

Lo Presher: Lo Presher is an American rock band formed in 1992 in Brevard County, Florida.  The band released three studio albums and toured extensively, including performances on the Vans Warped Tour.  The band is usually classified under Surf Rock, but fans are credited with labeling their style as "Tribal Alternative", a musical movement popular in the U.S. underground independent scene of the late nineties, of which the band is credited for influencing.  They are best known for their work on musical soundtracks for extreme sports videos and for their live, theatrical percussion performances in which they play homemade instruments.  "The band's name is sometimes credited as Lo Pressure or Low Pressure"

Eric Melvin: Eric Scott Melvin (born July 9, 1966) is an American musician and founding member of the punk rock band NOFX, a group that has sold over 6 million records worldwide, making them one of the most successful independent bands of all time.  Though most recognized for his ability to play the guitar, Melvin also plays the accordion.

Supporting paragraphs: Mel Schacher Grand Funk Railroad
Answer: bassist