From Wikipedia:

John Alec Entwistle (9 October 1944 – 27 June 2002) was an English bass guitarist, songwriter, singer, horn player, and film and record producer who was best known as the bass player for the rock band The Who. His aggressive lead sound influenced many rock bass players. He was inducted into the Rock and Roll Hall of Fame as a member of the Who in 1990.

Influence

Entwistle identified his influences as a combination of his school training on French horn, trumpet, and piano (giving his fingers strength and dexterity). Musicians who influenced him included rock & roll guitarists Duane Eddy and Gene Vincent, and American soul and R&B bassists such as James Jamerson. 

In turn, Entwistle has been a massive influence on the playing styles and sounds used by generations of bass players that have followed him, including Geezer Butler, Steve Harris, Matt Freeman, Krist Novoselic, Ian Hill, Geddy Lee, Billy Sheehan, Victor Wooten, Tom Petersson, and Chris Squire.

Entwistle continues to top ‘best ever bass player’ polls in musicians magazines.

• In 2000, Guitar magazine named him “Bassist of the Millennium”
• in a readers’ poll. J. D. Considine ranked Entwistle no. 9 on his list of “Top 50 Bass Players”.
• He was named the second best bassist on Creem Magazine‘s 1974 Reader Poll Results.
• In 2011, a Rolling Stone reader poll selected him as the No. 1 bassist of all time.

Short bio:

On Conan O’Brian in 1996:

Album of the day:

Other June-27:

• Jerome Solon Felder, better known as Doc Pomus (June 27, 1925 – March 14, 1991), was an American blues singer and songwriter. He is best known as the lyricist of many rock and roll hits. Pomus was inducted into the Rock and Roll Hall of Fame in the category of non-performer in 1992. He was also inducted into the Songwriters Hall of Fame in 1992. and the Blues Hall of Fame.