In 2016 early summer, she released her first studio album "Selfish." In fact, she made her debut as a solo female singer in 2011, and had kept on singing constantly. The debut single is, by the way, "Flower" lying at the 11th of the album.
To tell the truth, I hadn't listened to any of her solo songs until I happened to meet this album. Now, I feel "Selfish" correctly includes her 5 years, 2011-2016, without any extra elements.
In other words, you can hear Maeda Atsuko's growth in the 5 years with the songs. The more she grew up, the better her vocal became.
In "Flower," a tiny ballad song which cut the tape of her career, she sings weakly. On the other hand, she sings with some gimmicks in "Selfish," her brand-new song.
Totally, there are a lot of ballad songs, which might make you feel kind of sleepy. It's said the producer Akimoto Yasushi prepared a lot intentionally because Maeda was fond of ballad ones.
I believe Maeda Atsuko sounds better in uptempo songs like "タイムマシンなんていらない." Next time, I'd truly like to hear her sing upper songs with a band.