Probably Jason Blume, or Diane Warren, Or Sonny Throckmorton
Who cares!? Paul McCartney is the most successful songwriter of all time, that's all that matters! I'm an American, born and raised but Paul McCartney is way more talented than any American singer/songwriter could ever be! The only one who even compared to Paul McCartney was John Lennon who'd be either the 1st or 2nd most successful songwriter of all time if he were still alive.
Note: Paul McCartney holds the official record for most successful songwriter.
The song "Yesterday" by McCartney/Lennon is the most re-published song in history, however, on a lifetime career basis, Dianne Warren holds more #1 hits. See Billboard.com . Susan Gibson's "Wide Open Spaces" was recorded by The Dixie Chicks and holds several airplay records..
She was one of the most successful crossover performers in Latin music to date. AKA-Singer-songwriter, actress, writer
Tom Delonge is an American guitarist, songwriter and singer. He is a part of the American punk rock band Blink-182, which most definitely contributes the most to his fame.
It would have to be the great, and the talented, Charley Pride.
Miley Cyrus
Harry Nilsson was a singer and songwriter of American origin. His most well known song is probably 'Without You' which was later covered by Mariah Carey.
Taylor swift
Neil Sedaka is an American pop/rock singer, pianist, and songwriter. He is most known for his legendary work as a superstar from the Brill Building. Neil Sedaka is an extraordinary singer and songwriter.
Dannii Minogue is an Australian singer/songwriter. Her most successful tracks are as follows: Love and Kisses, This is It, Jump to the Beat and Baby Love.
Bill Anderson is known as an American singer, songwriter and television personality. He has released over 40 albums and is one of the most successful songwriters in country music history.
Devin Star Tailes (born 1989), known as Dev, is an American female rapper, singer and songwriter. "In the Dark," released in 2012, is her most successful solo single.
She was one of the most successful crossover performers in Latin music to date. AKA-Singer-songwriter, actress, writer
Jake Owen most famous for as an American country singer. His birth name is Joshua Ryan Owen born in August 28, 1981. He is a singer-songwriter with RCA Records Nashville.
Bill Withers
Daron Malakian is an American singer songwriter of Armenian heritage. He is most notably known as songwriter, guitarist and vocalist in the rock band System of a Down.
Fidelity, the hit by American singer/songwriter Regina Spektor, was released on March 12th 2007. As well as being her most successful single to date, it also marked her entry into the Billboard 100.
Tom Delonge is an American guitarist, songwriter and singer. He is a part of the American punk rock band Blink-182, which most definitely contributes the most to his fame.
Tyson Ritter (the lead singer) is the main song writer but Nick Wheeler (guitarist) writes most of the songs with him.