What's in the queue for the Top 20 countdown this week? Well, for starters, will.i.am is making his debut with '#thatpower,' his latest single featuring Justin Bieber and the hit maker's second song ('Scream & Shout' comes in at No. 16) on the Top 20 songs list for April 15 - 21, 2013.

Meanwhile, Justin Timberlake is also charting for the first time with his second '20/20' single, 'Mirrors,' which is currently notching in at No. 15 while 'Suit & Tie' continues its domination within the Top 3. Check out which other tracks you can expect to hear on PopCrush's radio show this weekend, and click through below to see a list of stations where you can tune in.

Top 20 Songs: Week of April 15 - 21, 2013

20. Justin Bieber, 'All Around the World'
19. Will.i.am, '#thatpower' Feat. Justin Bieber
18. Fall Out Boy, 'My Songs Know What You Did in the Dark (Light Em Up)'
17. Fun., 'I Will Wait'
16. Will.i.am, 'Scream & Shout' Feat. Britney Spears
15. Justin Timberlake, 'Mirrors'
14. Icona Pop, 'I Love It' Feat. Charli XCX
13. Taylor Swift, '22'
12. Krewella, 'Alive'
11. Taylor Swift, 'I Knew You Were Trouble'
10. Olly Murs, 'Troublemaker'
9. Swedish House Mafia, 'Don't You Worry Child'
8. Demi Lovato, 'Heart Attack'
7. Calvin Harris, 'Sweet Nothing' Feat. Florence Welch
6. Maroon 5, 'Daylight'
5. Pink, 'Just Give Me a Reason' Feat. Nate Ruess
4. Pitbull, 'Feel This Moment' Feat. Christina Aguilera
3. Justin Timberlake, 'Suit & Tie'
2. Rihanna, 'Stay' Feat. Mikky Ekko
1. Bruno Mars, 'When I Was Your Man'

Note: Every Monday, PopCrush will publish a list of our Top 20 songs for that given week. Then, over the weekend, fans can tune in to our national radio show to hear all of these hot songs plus some other amazing pop tunes. To see a list of radio stations where you can hear the PopCrush Top 20 countdown, click here.