Question: Which American musician born in 1951 was in a band that had a song certified Gold by the RIAA on December 18, 1990?

<P0-S0>  The song was certified Gold by the RIAA on December 18, 1990, and has also sold over 2 million downloads in the digital era. <P0-S1> "Carry On Wayward Son" is a single recorded by Kansas and written by Kerry Livgren for their 1976 album "Leftoverture". <P0-S2>  In 1977, the song peaked at No. 11 on the US "Billboard" Hot 100, becoming their first top 20 entry in the nation. <SEP> <P1-S0> American singer Mandy Moore has released six studio albums, three compilation albums, two video albums, twelve singles, and thirteen music videos. <P1-S1>  After being spotted singing at a recording studio by an artists and repertoire representative for Epic Records, Moore was signed to Sony Music. <P1-S2>  Her debut album, "So Real", was released in December 1999. <P1-S3>  The album performed moderately on the charts, peaking at number thirty-one on the "Billboard" 200 and was certified Platinum by the Recording Industry Association of America (RIAA). <P1-S4>  According to Nielsen SoundScan, "So Real" had sold about 950,000 copies in the United States, by June 2009. <P1-S5>  Her debut single, "Candy", peaked at number forty-one on the US "Billboard" Hot 100, and was certified Gold by the RIAA. <P1-S6>  It also reached the top forty in Canada, France, Ireland, and Switzerland and the top ten in Australia, New Zealand, and the United Kingdom. <P1-S7>  In Australia the song peaked at number two on the ARIA Singles Chart and was certified Platinum by the Australian Recording Industry Association (ARIA). <P1-S8>  "So Real" was followed up with "I Wanna Be with You", in May 2000. <P1-S9>  It is a re-release of the debut album, with remixed tracks and few new songs, the album reached number twenty-one on the "Billboard" 200 and was certified Gold by the RIAA. <P1-S10>  It also went on to sell about 805,000 copies in the US by June 2009. <P1-S11>  The album spawned only one single, the title track, which peaked at number twenty-four on the Hot 100, becoming Moore's only top-thirty song in the US and her highest peak to date. <P1-S12>  The song also reached number thirteen in Australia and was certified Gold by the ARIA. <SEP> <P2-S0> Iron Flag is the fourth studio album by American East Coast hip hop collective Wu-Tang Clan, released on December 18, 2001 on Loud Records. <P2-S1>  It was certified gold in sales by the RIAA. <P2-S2>  "Iron Flag" served as the group's second lowest-selling album (687,000 copies), as their record label, Loud, was on the verge of shutting down at the time. <P2-S3>  The album debuted at No. 32 on the "Billboard" 200 with 153,000 copies sold in its first week of release. <P2-S4>  It has sold 500,000 copies in the United States, & certified Gold by the RIAA on January 29, 2002. <SEP> <P3-S0> Steve Walsh (born June 15, 1951) is an American musician, singer and songwriter best known for his work as a member of the progressive rock band Kansas. <P3-S1>  He retired from the band in 2014 He sings lead on four of Kansas' best-known hits: "Carry On Wayward Son," "Dust in the Wind", "Point of Know Return", and "All I Wanted", the last two of which he also co-wrote.