who is the first singer mentioned above?
American singer, songwriter, actor, and record producer.
Justin Timberlake
Justin Randall Timberlake (born January 31, 1981), occasionally known by his initials JT, is an American singer, songwriter, actor, and record producer. 
cry me a river justin timberlake britney spears "Cry Me a River" is a song by Justin Timberlake. The lyrics were inspired by Timberlake's former relationship with singer Britney Spears. who produced it? Timbaland
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Justin Timberlake [SEP] Introduction
Justin Randall Timberlake (born January 31, 1981), occasionally known by his initials JT, is an American singer, songwriter, actor, and record producer. Born and raised in Tennessee, he appeared on the television shows "Star Search" and "The All-New Mickey Mouse Club" as a child. In the late 1990s, Timberlake rose to prominence as one of the two lead vocalists and youngest member of NSYNC, which eventually became one of the best-selling boy bands of all time. Timberlake won two Grammy Awards for his R&B-focused debut solo album "Justified" (2002) and its single "Cry Me a River". Another single from the album, "Rock Your Body", was also successful.