“This Is Acting” isn’t your typical album. Released by Sia Furler, stage name Sia, the 12 songs are all rejected tracks written for other artists by Sia herself. The name “This Is Acting” draws from her portrayal of different characters as she sings songs that may not fit her usual style.

Sia isn’t new to songwriting; she can be credited for hits such as Rihanna’s “Diamonds” and “Flashlight,” the theme from “Pitch Perfect 2,” recorded by Jessie J. Her worldwide hit, “Titanium,” threw her into international stardom in 2011; her artful music video for “Chandelier” has more than one billion views on YouTube. “This is Acting” is the most pop-influenced of all of her albums, straying away from her usual genre of soul and hip-hop vocals.

The album starts off with “Alive” and “Bird Set Free,” both of which were written for Adele, and with the piano banging in the background while Sia sings, you can definitely tell. There is no lack of pop anthems or dance tunes, the best of which is “Move Your Body,” a track originally written for Shakira that gives off more of a Lady Gaga vibe. “Unstoppable” isn’t particularly creative in lyrics or sound, but it enforces the pop vibe with an explosive chorus about being invincible and confident.

“One Million Bullets,” the only song written by Sia with herself in mind, possesses an emotional depth that the others lack. It seems that in embodying different artists, Sia has lost her true identity as a performer, which she so clearly defined in her previous album, “1000 Forms of Fear.” She doesn’t achieve the raw sound or intuitive lyrics that have been her calling card in the past. She writes with the pop industry in mind: formulaic, repetitive, the same four chords played in different orders.

Overall, the album has a lot of songs that are great individually. When pushed together, however, nothing really seems to match up. This album earns a B- for its creative concept that doesn’t quite flow like a cohesive compilation should. While Sia’s voice is clear and beautiful throughout, “This is Acting” doesn’t deliver the punch I’ve come to expect from her in the past few years. Not even close.