Tide

Tides are the rise and fall of sea levels caused by the combined effects of gravitational forces exerted by the Moon, Sun, and rotation of the Earth.

The times and amplitude of tides at a locale are influenced by the alignment of the Sun and Moon, by the pattern of tides in the deep ocean, by the amphidromic systems of the oceans, and the shape of the coastline and near-shore bathymetry (see Timing). Some shorelines experience a semi-diurnal tide - two nearly equal high and low tides each day. Other locations experience a diurnal tide - only one high and low tide each day. A "mixed tide"; two uneven tides a day, or one high and one low, is also possible.

Tides vary on timescales ranging from hours to years due to a number of factors. To make accurate records, tide gauges at fixed stations measure the water level over time. Gauges ignore variations caused by waves with periods shorter than minutes. These data are compared to the reference (or datum) level usually called mean sea level.

Alicia Keys

Alicia Augello Cook (born January 25, 1981), known by the pseudonym Alicia Keys, is an American singer, songwriter, record producer, and actress. Keys released her debut album with J Records, having had previous record deals first with Columbia and then Arista Records. Keys' debut album, Songs in A Minor, was a commercial success, selling over 12 million copies worldwide. She became the best-selling new artist and best-selling R&B artist of 2001. The album earned Keys five Grammy Awards in 2002, including Best New Artist and Song of the Year for "Fallin'" becoming the second American recording artist to win five Grammys in one night. Her second studio album, The Diary of Alicia Keys, was released in 2003 and was also another success worldwide, selling eight million copies. The album garnered her an additional four Grammy Awards in 2005. Later that year, she released her first live album, Unplugged, which debuted at number one in the United States. She became the first female to have an MTV Unplugged album to debut at number one and the highest since Nirvana in 1994.

Joe Jonas

Joseph Adam "Joe" Jonas (born August 15, 1989) is an American singer and actor. Jonas first rose to fame as a member of the pop-rock band Jonas Brothers, along with his brothers Kevin and Nick. The band's debut album, It's About Time (2006), was a commercial failure following a limited release. The group signed with Hollywood Records, and in 2007 released their eponymous second studio album. The album went on to be a commercial success for the group, selling over two million copies in the United States alone. The group became heavily involved with the Disney Channel, and later made their film debut in the Disney Channel Original Movie Camp Rock (2008). The film, and its soundtrack, became a major hit for the network, and helped propel the brothers into further commercial success. Their third studio album, A Little Bit Longer (2008), became their first to top the Billboard 200, and went on to become their highest selling album to date. The album's lead single became a top five hit in the United States. Their fourth studio album, Lines, Vines and Trying Times (2009) became their second to top the charts in the United States. The brothers also starred in two of their Disney Channel series from 2009 to 2010, being JONAS L.A. and Jonas Brothers: Living the Dream. In 2010, the group starred in Camp Rock 2: The Final Jam, reprising their roles from the original film.

Jay Z

Shawn Corey Carter (born December 4, 1969), known by his stage name Jay Z (formerly Jay-Z), is an American rapper, record producer, entrepreneur, and investor. He is one of the most financially successful hip hop artists and entrepreneurs in America. In 2014, Forbes estimated Jay Z's net worth at nearly $520 million. He is one of the world's best-selling artists of all time, having sold more than 100 million records, while receiving 21 Grammy Awards for his musical work, and numerous additional nominations. Consistently ranked as one of the greatest rappers ever, he was ranked number one by MTV in their list of The Greatest MCs of All-Time in 2006. Three of his albums, Reasonable Doubt (1996), The Blueprint (2001), and The Black Album (2003), are considered landmarks in the genre with all of them featured in Rolling Stone's list of the 500 greatest albums of all time.

As an entrepreneur and investor, Jay Z co-owns the 40/40 Club, and is the co-creator of the clothing line Rocawear. He is the former president of Def Jam Recordings, co-founder of Roc-A-Fella Records, and the founder of Roc Nation. He also founded the sports agency Roc Nation Sports and is a certified NBA and MLB sports agent. As an artist, he holds the record for most number one albums by a solo artist on the Billboard 200 with 13. Jay Z also has had four number ones on the Billboard Hot 100, one as lead artist. On December 11, 2009, Jay Z was ranked as the tenth-most successful artist of the 2000s by Billboard as well as the fifth top solo male artist and fourth top rapper behind Eminem, Nelly, and 50 Cent. He was also ranked the 88th greatest artist of all time by Rolling Stone.