My favorite band is The Story So Far! It's a pop punk band.
I don't know anything about them.  are they very popular?
Not as much, they're signed in with Pure Noise  Records and have released 3 albums so far.
What is some of their songs?
June 18. This split contains one new original song, Clairvoyant, and a cover of Pinback's song "Loro". The band was featured on the cover of Alternative Press' March 2013 issue "100 Bands You Need to Know." The band played the entire Warped Tour 2014 on the main stage.
On April 24, 2014, The Story So Far announced they would be releasing "Songs Of", an acoustic EP on June 17 through Pure Noise. The record contains some acoustic versions of previous songs
What You Don't See
What You Don't See is the second studio album by American pop punk band The Story So Far.
Background.
The Story So Far signed to Pure Noise in March 2010. The band released their debut album in June 2011. The band supported We Are the Union and I Call Fives in July. The band toured alongside Heartsounds and Handguns in August. The band supported Senses Fail in November. From late February to early March 2012 the band went on the Pure Noise Records Tour