Hannah had never tried rapping before visiting BBC Blast

BBC News' Christopher Sleight went to see the "Blast" truck in Cardiff.

Hannah Ebdon is standing with a microphone in one hand and a clipboard in the other, rapping about a girl who has a crush on a boy.

It's the first time the 17-year-old from Bridgend has written or performed a rap - let alone in front of a group.

She's nervous, but gains confidence as the audience shows its appreciation.

Neeco Katis (l) and Daniel Johnson tutor youngsters at Blast

Hannah has spent the morning in the beat box workshop at the BBC's mobile "Blast" studio at Britannia Quay in Cardiff Bay.

Under the tutelage of Daniel Johnson and Neeco Katis - both 17 and students at Cardiff's Immtech College - she has written and performed her first rap.

"When they said you have got to do 16 bars, I thought no, I won't do that, but I did," says Hannah, an A-level student at Brynteg School in Bridgend.

"I had to think of a word describing how I was feeling and then write it at the end of the sentence."

Fellow pupil Sian Rowlands, 17, was also pleased with her progress during the workshop.

"I'm quite surprised I wrote so much in the time we had - I didn't think I would be able to write so much," she says.

Peter (l) and Sam watch Kavanagh slot another one in for Cardiff

But multimedia students Daniel and Neeco aren't so surprised - they reckon they can teach anyone to rap.

"Just keep it simple," says Daniel.

"Start with the basics. Start with a word, think of a subject and put it into a rhyming sentence."

The beat box workshop is just one of many available in the BBC's 40-ft Blast truck, now on its sixth stop of a tour of venues across the UK.

Youngsters can also try their hand at animation, sports commentary or mixing their own CD - or take part in a drama workshop.

Blast co-ordinator for BBC Wales, Susan Wood, says it is an effective way to connect with younger audiences - and can give young talent access to BBC expertise and technology.

"It's to give them an insight into what we do - and give them the opportunity to work alongside BBC staff and mentors," she said.

Budding journalists, poets, rappers, film makers or animators are all welcome at the truck.

More information at bbc.co.uk/blast

Many of the performances are filmed or recorded and then placed on the BBC Blast website.

And on Thursday, pupils will film an item which will then be broadcast on the BBC's Welsh language news programme Ffeil, shown on S4C.

Meanwhile, in the sports box, two Willows High School pupils are preparing to commentate on a Graham Kavanagh free kick for Cardiff City against Leeds.

Peter Hewett goes first - after stipulating he will try commentating on football as long as it's "nothing to do with Swansea".