It began with a sing-song, as it frequently does in Wales, and its legacy includes the question "what's occurring?" and the most well-known doctor in the world.
However, the BBC in Wales hasn't just given us programs like Gavin and Stacey and Doctor Who; it has also covered the most significant historical events in the nation.
I searched the archives to uncover its most significant moments since 1923 as Monday marks the 100th anniversary of the BBC's first broadcast in Wales.
On the evening of the BBC's first broadcast from Wales on February 13, 1923, baritone Mostyn Thomas performed the traditional Welsh folk song Dafydd y Garreg Wen, which marked the beginning of radio broadcasts honoring Welsh culture.
On August 3, 1924, The Royal National Eisteddfod of Wales was first broadcast on the BBC by Cardiff's 5WA, which at the time was the only BBC radio station in Wales.
The BBC now broadcasts the National Eisteddfod in both Welsh and English, making it the third-largest outside event behind Wimbledon and Glastonbury.
One of the most contentious events in contemporary Wales was the damming of the River Tryweryn and the flooding of the Snowdonia village of Capel Celyn in order to build a reservoir and supply water to an English city.
Although not a single Welsh MP cast a vote in favor, a bill authorizing the reservoir for the former Liverpool Corporation was approved by parliament. Since then, Liverpool has expressed regret for the "hurt" and "insensitivity" that was caused.
The development of Llyn Celyn is frequently credited with sparking the devolution movement. In February 1963, bombs were dropped on the dam as it was being built.
The person who led the effort to stop Tryweryn was elected as Plaid Cymru's first Member of Parliament the year after it was founded.
Drivers used to need the entire day to travel from south Wales to London or even Bristol. However, that travel time was drastically reduced when The Queen cut the first Severn Bridge's ribbon in 1966, opening up south Wales like never before.
A better connection between south Wales and the rest of the country is provided by the Severn Bridge, which was also a part of Wales' first section of motorway.
After weeks of nonstop rain, one of the darkest days in Wales' history occurred when a coal tip slid down onto Aberfan in the south Wales valleys, killing 144 people, including 116 children.
Just before coal tip number seven engulfed Pantglas Junior School and houses in that area of the village, students had arrived for their final day before the October half-term.
At a lavish ceremony held at Caernarfon Castle, the young Prince Charles, then just 20 years old, was formally invested as the Prince of Wales.
500 million people around the world watched the six-hour broadcast on TV.
Opinion in Wales was divided over the title and investiture of the Prince of Wales. Protests and even bombings served as the background for the event.
Rugby is one of the things that is most associated with Wales, and while there have been many outstanding Welsh rugby victories over the years, THAT try by Gareth Edwards has to rank as the greatest one.
In January of 1968, Edwards faced off against the formidable All Blacks in Cardiff, but he was playing for the Barbarians, not Wales. Click the video above to see it for yourself.
The most well-known resident of Pontypandy first heard his fire bell ring on Welsh language television as Sam Tan. But a few weeks later, Sam also won the title of "hero next door" on the BBC, and he quickly became a hit all over the world.
Wales' top children's TV export, Fireman Sam, is broadcast in 155 nations and 36 languages worldwide. It is the preferred cartoon of a certain heir to the throne, Prince George.
When a 147,000-ton tanker ran aground on rocks in west Wales, 72,000 tonnes of oil were spilled over 120 miles (193 km) of coastline.
When tragedy struck and crude oil leaked onto the UK's only coastal national park, the Sea Empress was en route to an oil refinery close to Pembroke.
When Wales chose to have its own government, in what has been called "one of the most important days in our country's history," the then-Welsh secretary Ron Davies said, "Good morning, and it is a very good morning in Wales.".
When the assembly first convened in Cardiff Bay in 1999, just weeks before The Queen and Prince of Wales formally inaugurated the new administration, Alun Michael served as the leader of the first minority Labour administration.
The decision to hold the premier match of English football outside of the country while Wembley Stadium was being rebuilt at first stirred up controversy.
However, because Cardiff was broadcast around the world, fans quickly came to love FA Cup finals taking place there.
When Doctor Who received a reboot by BBC Wales and renowned Welsh screenwriter Russell T Davies in 2005, it instantly became a global phenomenon. Doctor Who was once a science fiction cult TV classic.
With a global audience of 100 million people in 65 countries, it has become the focal point of BBC One's Saturday schedule.
The popular BBC sitcom, which is filmed in and around the seaside town of Barry, has established itself as one of the biggest and best in the UK of the twenty-first century.
More than a quarter of the UK's population watched Gavin and Stacey's comeback Christmas special in 2019. It is the comedy that popularized a number of catchphrases, including Nessa's "tidy" and "Oh, what's happening?"
