We're finally at the end of the letter "A." Sigrid talks about the unstressed sound of "A" in words, and gives us some examples. For other pronunciations, see parts 1, 2, and 3.

Rory Graham, better known as Rag'n'Bone Man, is a British singer-songwriter from Uckfield, East Sussex, England. Here's his debut hit single "Human," released on Columbia Records in July 2016.

Shania Twain's "That Don't Impress Me Much" was released in 1998 as her third country single, and it remains one of her biggest hits worldwide. The title takes some poetic license. Can you find the mistake in grammar?

American TV show Entertainment Tonight reports on the latest news between American singer and actress Selena Gomez, and Canadian singer-songwriter, actor and producer The Weeknd with an eyewitness account of their Italian getaway.

Sigrid explains that "A" is also a very important one-letter word.

"Hotline Bling" is a R&B and hip hop song sung by Canadian rapper Drake. The song received two nominations at the 2017 Grammy Awards for Best Rap Song and Best Rap/Sung Performance.

The Black Eyed Peas originally are from Los Angeles. The video for "Just Can't Get Enough" from their sixth studio album was shot in Japan.

They may be too young to vote, but they certainly are curious. Barack and Michelle Obama answer some more questions from their very young constituents.

Barack and Michelle Obama take on some tough questions from very young constituents.

Ed Sheeran gives us this exclusive, FIRST EVER live performance of "Castle on the Hill" live for the BBC Radio 1 Breakfast Show!

"Shape of You" is a hit single from Ed Sheeran's album Divide and has gone on to win a Grammy and to be considered one the most successful songs of all time. A fun fact is that the song had originally been written with Rihanna in mind, but in the end, Ed Sheeran kept it for himself.

Sigrid explains a third way to pronounce the letter "A." For the first two ways, see Sigrid explains: the letter A - Part 1 of 4.

It's "If You're Happy And You Know It" made Super Simple! Practice the emotions happy, angry, scared, and sleepy with this super fun song for kids.

"Everything at Once" is a song written and recorded by Australian singer Lenka.

Career expert Nicole Williams gives us some simple but useful tips for making a good first impression at a job interview.