Question: Which artist was an important figure in the musical style called Nederpop?

Context paragraphs:
Andy Tielman: Andy Tielman (30 May 1936 – 10 November 2011) was an influential Indo (Eurasian) artist, recognised as the "godfather" of Indorock, the style of rock and roll played by Indo artists in the 1950s and 1960s.  He is considered one of the most important figures in Dutch popular music, and "defied the notion that early rock and roll was a phenomenon of white and black musicians from America".

Polo (flamenco palo): Polo (] ) is the name of a flamenco palo or musical form.  There is only one known song in this "palo", which is extremely similar to another palo called caña, and its guitar accompaniment, like the "caña", shares its rhythm and motifs with soleá.  Both the "caña" and "polo" share the same musical mode.  The "polo" has usually been considered as a derivation of the "caña".  To complete the singing of the polo, singers usually sing a stanza in the "palo" of soleá, generally in the style called "soleá apolá".

Edge of Spirit: Edge of Spirit was a Japanese hardcore band formed in Kobe, Hyogo and based in Tokyo.  Edge of Spirit has released four studio albums and four split albums.  The band is widely known for pioneering its musical style called metalcore / metallic hardcore.  The band toured as an opening act for Arch Enemy Japan tour in 2002 and 2004.  After their 3rd album "Rebirth", they toured as an opening act for Extreme The Dojo tour featuring The Haunted, Nile, and Exodus in 2006.  The band toured Australia with The Rivalry and Palm in 2007, Canada and United States with Sand in 2008, and Europe with Rise Of The Northstar in 2011.  In April 2016, the band announced they are going on hiatus.

Gustaf Grefberg: Gustaf Grefberg (born 1974) is a Swedish musician.  As part of the Amiga scene, he is known under the artist name Lizardking, and much of his production is tracker music.  He is or has been a member of the demo groups Alcatraz, The Silents, Razor 1911, The Black Lotus and Triton.  He and Joakim Falk invented a musical style called Doskpop and he released various music disks such as "Doskpop The Compilation" or "Memorial Songs 1+2" which feature lots of tracks in this style.  He also took part in projects such as Merregnon and the Symphonic Game Music Concert-series in Leipzig, Germany.

Music of the Netherlands: The Netherlands has multiple musical traditions.  Contemporary Dutch popular music (Nederpop) is heavily influenced by music styles that emerged in the 1950s, in the United Kingdom and United States.  The style is sung in both Dutch and English.  Some of the latter exponents, such as Golden Earring and Shocking Blue, have attained worldwide fame.

Jimmy LaFave: Jimmy LaFave (July 12, 1955 – May 21, 2017) was an American singer-songwriter and folk musician.  After moving to Stillwater, Oklahoma, LaFave crafted a musical style called Red Dirt music and became a disciple of the state's most famous folk musician: Woody Guthrie.  LaFave was an Advisory Board member and regular performer at the annual Woody Guthrie Folk Festival.

Felton Messina: Felton Messina started practicing Karatedo in 1966, while studying in the University of Puerto Rico, city of Mayagüez, supervised by his first teacher, the Puerto Rican Edwin Hernández in a style called Okinawan Kenpo Karatedo.  In 1968 he was promoted to black belt 1st Degree and received the grade certificate from Edwin Hernández.  In 1969, Felton Messina returned to the Dominican Republic having graduated as an electrical engineer.  When he arrived in Santo Domingo, the only martial arts practiced there, were Judo and Taekwondo.  When a group of young people heard of his arrival, they asked him to teach them the style of striking martial art that he had learned in Puerto Rico.  In 1969 the Kenpo Karatedo Association was formed by Felton Messina, and this new style spread throughout the whole Caribbean nation.  While being president of the Dominican Judo Federation, , he was advised by the president of the Dominican Olympic Committee, to form what to this day is known as the Dominican Karate Federation (DOKAFE), which was recognized as well by the Dominican Olympic Committee.  With the recognition of DOKAFE by the Dominican Olympic Committee Felton Messina quits from his position as President of the Dominican Judo Federation and becomes the first president of the Dominican Karate Federation.  In 1975, Felton Messina stops practicing Okinawan Kenpo and begins practicing the "Nihon Koden Shindo Ryu" style of Karatedo under the teachings of Hiroyuki Hamada, native from the province of Sendai, Japan.

Tjauti: Tjauti was an Ancient Egyptian official who lived at the end of the Eighth Dynasty, around 2150 BC.  He is known from a number of sources providing evidence that he was an important figure in the Coptic Nome in Upper Egypt.  However, the sources are often broken and the figure of Tjauti remains therefore enigmatic.  The most important objects naming Tjauti are the fragments of a false door found near Khozam (compare: Iushenshen) where he is called "overseer of Upper Egypt", which was one of the most important titles in the Old Kingdom.  He is also called "the one who fills the heart of the king" showing some close connection to the royal court.  A person called Tjauti-iqer also appears in several inscriptions in the Wadi Hammamat, reporting the transport of stones: Tjauti-iqer seems to be a variant of the name.  The inscriptions also mentions the "god's father" Idy, who was the son of Shemay.  Shemay lived at the end of the Eighth Dynasty providing also a date for Tjauti to about the same period.  A further inscription was found at the rock today called Gebel Tjauti (the rock is named after Tjauti) which is today much destroyed, but gave rise for some speculation as some fights seems to be mentioned.  The inscription seems to report the opening of a road.  Close to this inscription was found another one naming a king Intef and the "assault of soldiers".  The publication of the inscription sees a connection between these two inscriptions and identifies Intef, with Intef I.

Kir Stefan the Serb: Kir Stefan the Serb (second half of the 14th and 15th century) was a Serbian monk, protopsaltos, musicologist, choirmaster and more importantly, composer of the chants developed within the sphere of the activities of Byzantine culture in the Serbian state.  Together with (but independently from) Isaiah the Serb and Nikola the Serb he followed faithfully the Byzantine musical traditions, writing in the late kalophonic style of the 14th and 15th centuries.  With his distinctive compositional style, he is one of the earliest (if not the earliest) identifiable Medieval Serbian composers and also one of the original founders of new and distinctive style called "Serbo-Byzantine school".

Palito Ortega: Ramón Bautista Ortega (born March 8, 1942) is an Argentine singer and actor, better known as Palito Ortega.  (] ) Ortega It's icon of Popular Argentine Music.  Considered one of the main Argentine representatives of the musical style called New wave that marked the Hispanic-American music between the years '60 and '70.  Ortega reached international fame, particularly in Latin America and Spain, during the 1960s, when the rock en español style of rock and roll music was popularized among teenagers in the region.

Supporting paragraphs: Andy Tielman Music of the Netherlands
Answer: Andy Tielman