as a sophomore music major, she meets vocalist luke smith, also in the program. >> we met when luke was a freshman and i was a sophomore here, at s.o.u. and we just -- we clicked right away. we had similar personalities, being dorky, loud and silly and maybe a little misunderstood. our friendship blossomed, and we became best friends very quickly. >> reporter: and then, it became romantic? you started dating -- >> yeah. yes, it did. it was a surprise, i think, for both of us. >> reporter: months passed. the relationship progressed and became sexual. but soon luke was pressing niki to engage in a type of sex that she wasn't comfortable with. and one night last spring, she's sleeping over at luke's apartment. tell me what you remember about that night. >> we had tried watching a movie. i wasn't able to fall asleep. and so i decided to take a sleeping pill. and he knew i was taking it. it wasn't working, and it was getting really late. and i had class early in the morning. so i took a second one, and i fell asleep really quickly. but i -- i remember dozing off, and he was still awake, and

. ♪ she said play it again ♪ >> luke bryan lit up the summer charts. sam smithns swoon with "stay with me." ♪ won't you stay with me ♪ cause you're all i need ♪ >> i hate to admit it, i'm just now getting caught up with lorde. >> i'm an old person, old soul, but i have been jamming out to taylor swift. >> we have to give the best job of taking it to the bank to taylor swift. she shook off the competition all year long. ♪ shake it off ♪ >> her mind blowing song, sales and business empire made her the reigning queen of pop music. ♪ coming at you like a dark horse ♪ >> the best selling song by a female artist according to neilsen goes to "katy perry's dark horse." and ed sheeran hit it with 860 million listens to his tune "don't." ♪ that hard is so cold all over my own ♪ >> it's angry, it's vengeful. it's really catchy. all of those are very good for songs. >> and billboard says the most weeks at number one on digital songs by any group goes to magic for their catchy song "rude." ♪ why you got to be so rude >> worst music video for a family audience? it is "anacond

. ♪ and she said play it again, play it again, play it again ♪ luke bryan lit it up with the single, sam smithme. ♪ oh won't you stay with me, cause you're all i need ♪ ♪ >> i hate to admit it, i'm just now getting caught up with lorde. i think lorde is great. and you know, so i like her. >> i'm kind of an old, old soul musically, i have been jamming out to taylor swift. >> and we have to give the best job of taking it to the bank to taylor swift. who shook off the competition all year long. ♪ her mind blowing song, sales, promotional efforts enefforts of her empire made her the reigning queen of pop music. ♪ because i'm coming at you like a dark horse ♪ the best self song by an artist goes to katy perry's dark horse which moved more than 4.3 million copies. still the guys were no slouches, ed hit it hard as the most streamed artist in the world with 860 million listens to his tunes. especially "don't." ♪ >> it's angry, it's vengeful, it's primal, and it's really catchy. which i mean, all of those are very good for song. >> billboard says the most weeks at number one on digital songs by any gr

. ♪ play it again >> luke bryan lit up the country charts with his song, sam smith made his fans swoonay with me. ♪ oh, won't you stay with me? 'cause you're all i need ♪ ♪ they used to shout my name, now they whisper it ♪ >> i hate to admit it. i'm just getting caught up with lorde. i think lorde is great. >> i'm an old person, old soul musically but i have been jamming out to a little taylor swift. >> we have to give the best job of taking it to the bank to taylor swift who shook off the competition all yearlong. her mind blowing song sales, promotional efforts and business empire made her the reigning queen of pop music. because i'm coming at you like a dark horse ♪ the best selling song by a female artist goes to katy perry's "dark horse" more than 4.3 million copies. still, the guys no slouching. ed sheeran, the most streamed artist in the world with 860 million listens to his tunes, especially "don't." >> it's angry, it's vengeful, it's primal, and it's really catchy which i mean, all of those are very good for a song. >> and billboard said the most weeks at number one on digital

. ♪ she said play it again, play it again, play it again ♪ >> luke bryan lit up the country charts with his summer single. sam smith me." ♪ won't you stay with me ♪ 'cause you're all i need ♪ they used to shout my name ♪ ♪ now they whisper it >> i hate to admit it. i'm just now getting caught up with lorde. i think lorde is great. i like her. >> i'm kind of an old, old person, old soul musically, but i kind of have been jamming out to a little taylor swift. >> and we have to give the best job of taking it to the bank to taylor swift, who shook off the competition all year long. ♪ shake, shake, shake, shake it off ♪ ♪ shake it off her mind-blowing song sales, promotional efforts, and expansion of her business empire made her the reigning queen of pop music. ♪ 'cause i'm coming at you like a dark horse ♪ >> the best-selling song by a female artist according to nielsen soundscan goes to katy perry's "dark horse" which moved more than 4.3 million copies. still, the guys were no slouches. ed sheeran hit it hard as the most streamed artist in the world, with 860 million listens to his tunes. especially "don't." ♪ with my

luke brian wishing you a happy holidays. >> happy holiday. >> hey, happy holidays. >> good morning, america. happy holidays. drive safe. >> happy holidays. >> hi i'm sam smithapplause ] >> whoa. ♪ major: ok fitness class! here's our new trainer ensure active heart health. heart: i'm going to focus on the heart. i minimize my sodium and fat... gotta keep it lean and mean. pear: uh-oh. heart: i maximize good stuff like my potassium... and phytosterols, which may help lower cholesterol. major: i'm feeling energized already. avo: new delicious ensure active heart health supports your heart and body, so you stay active and strong. ensure. take life in. ♪ the weather outside is frightful ♪ ♪ but the fire is so delightful ♪ [ male announcer ] nothing melts away the cold like a hot delicious bowl of chicken noodle soup from campbell's. ♪ let it snow, let it snow ♪ it's the time of year to bundle up. now at at&t, when you buy any smartphone for $0 down you can get an lg tablet for free. because two devices are cozier than one. i've smoked a lot and quit a lot but ended up nowhere. now...i use this. the nicoderm cq patch with unique extended release technology helps