October 30 is the 303rd day of the year, there are 62 days left
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Today's number is 30

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30 is
30 is the sum of the first four square numbers: 1+4+9+16
30 = 5 x 6; half of the base for the decimal system x half of the base for the duodecimal system = half of the base for the Sexagesimal system (Sumeria, Babylonia). Distributive law at work. There is a lot here but I won't get into it.
30 is zinc
30 is reporter and editor code for end of story
30 is the minimum age to be a US Sentor

30 seconds over Tokyo was a book about the World War II "Doolittle Raid" written by Major Ted William Lawson which was also made into a movie

M30 is a globular cluster in the constellation Capricorn

There were 30 uprights in Stonhenge's Sarsen Circle

There are 30 variations in Bach's Goldgerg Variations

.30 caliber was both a machine gun and a carabine used by the US military

.30-30 and .30-06 were historically significant weapons (a carabine & a rifle)

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Title 30 of the US Code is MINERAL LANDS AND MINING

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30 BCE
was the Year of the Consulship of Octavian and Crassus
Gaius Julius Caesar Octavian, aka Augustus, became Roman Consul for the fourth time, captured Alexandria and annexed Ancient Egypt to the Roman Republic.
Cleopatra comitted suicide and Ptolemy XV Caesarion was executed, which ended the Ptolemaic dynasty, the last dynasty of Ancient Egypt.
Mark Antony, Cleopatra VII, Ptolemy Caesar, Marcus Antonius Antyllus, and Hyrcanus II, king of Judea all died.
Eventual king of the Marcomanni, Maroboduus, was born.

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30 CE
was the Year of the Consulship of Vinicius and Longinus
Phaedrus translated Aesop's fables
Nerva, an eventual Roman Emperor, and Poppaea Sabina were born
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On this day in:

0758 – Guangzhou was sacked by Persian and Arabian pirates.
1817 – Simon Bolivar established the independent government of Venezuela.
1831 – Nat Turner was arrested for leading a slave revolt
1888 – King Lobengula of Matabeleland granted the Rudd Concession to agents of Cecil Rhodes
1918 – The Ottoman Empire signed an armistice with the Allies
1938 – Orson Welles broadcast Wells's The War of the Worlds over the radio (or did he?)
1941 – FDR approved $1 billion in Lend-Lease aid to the Allies
1944 – Anne and Margot Frank were deported from Auschwitz to Bergen-Belsen
1945 – Jackie Robinson signed with the Dodgers
1947 – GATT was signed, setting a foundation for the subjugation of everybody to the WTO
1960 – The first successful kidney transplant
1961 – The Soviets detonated the Tsar Bomba still the biggest bomb evar
1973 – The Bosphorus Bridge was completed, reconnecting Europe and Asia there
1975 – Prince Juan Carlos took over for Franco.
2014 – Sweden officially recognized Palestine

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Born this day in:

1735 – John Adams, lawyer and politician
1751 – Richard Brinsley Sheridan, poet and playwright
1839 – Alfred Sisley, impressionist painter
1857 – Georges Gilles de la Tourette, physician
1871 – Paul Valery, poet and philosopher
1881 – Elizabeth Madox Roberts, poet and author
1885 – Ezra Pound, poet
1886 – Zoe Akins, playwright, poet, and author
1897 – Agustin Lara, singer, songwriter and actor
1908 – Patsy Montana, singer, songwriter and actor
1925 – Tommy Ridgley, singer and bandleader
1930 – Clifford Brown, composer and trumpet player
1932 – Louis Malle, director and screenwriter
1934 – Frans Bruggen, flautist and conductor
1939 – Eddie Holland, singer and songwriter
1939 – Grace Slick, singer and songwriter
1944 – Ahmed Chalabi, sleazy, lying, opportunistic, sack-of-shit,**
1946 – Chris Slade, drummer
1947 – Timothy B. Schmit, bassist, singer and songwriter
1951 – Trilok Gurtu, percussionist and songwriter
1951 – Poncho Sanchez, singer and conga player
1954 – T. Graham Brown, country singer, y'all
1954 – Jeannie Kendall, 'nuther one
1958 – Olav Dale, composer, played sax & other woodwinds
1968 – Ken Stringfellow, singer, songwriter and guitarist
1969 – Snow, singer

*** believed and relied upon, however, by all 17 intelligence agencies, though, seemingly, by them alone, which isn't too surprising.

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Died this day in:

1910 – Henry Dunant, founded the Red Cross
1919 – Ella Wheeler Wilcox, author and poet
2007 – Robert Goulet, actor and singer
2013 – Frank Wess, saxophonist and flautist

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Holidays, Holy Days, Festivals, Feast Days and such:
Mole Day (International observance)

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So, for music,
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War of The Worlds

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Agustin Lara

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Patsy Montana

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Tommy Ridgley

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Clifford Brown

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Frans Bruggen

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Eddie Holland

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Grace Slick

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Chris Slade

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Timothy B. Schmit

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Trilok Gurtu

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Poncho Sanchez

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T. Graham Brown

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Jeannie Kendall

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Olav Dale

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Ken Stringfellow

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Snow

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Bonus:
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Clifford Brown

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Jazz Baltica: Trilok Gurtu

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Poncho Sanchez

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Grace Slick

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picture is a US Government work