Cassette\u00a0album sales continued to show growth in 2017, led by all things\u00a0Guardians of the Galaxy. Last year, cassette album sales rose by 35 percent to 174,000 copies sold, according to Nielsen Music. In 2016, there were 129,000 sold. Still, cassettes remain an incredibly niche format, as they only comprised 0.10 percent of all album sales in 2017, and just 0.17 percent of physical album sales.\u00a0That said, comparatively, in 2009, 2010 and 2011, cassette album sales numbered just 34,000; 21,000 and 31,000; respectively. So, while the format is still mostly a curiosity in 2017, it has made some sizable gains in recent years, and has seen some pretty major albums garner releases on cassette in the past few year or so. Among those:The Hamilton Mixtape\u00a0compilation,\u00a0Lana Del Rey's\u00a0Lust for Life\u00a0and\u00a0Taylor Swift's\u00a0Reputation. Nielsen Music\u2019s 2017 tracking year ran from\u00a0Dec. 30, 2016 through Dec. 28, 2017. Numbers in this story are rounded. Nielsen Music began electronically tracking music sales and data in 1991 (so a reference in this story to the \u201cNielsen-era\u201d means from 1991 to the present). The second\u00a0Guardians of the Galaxy\u00a0film\u2019s companion album,\u00a0Guardians of the Galaxy, Vol. 2: Awesome Mix Vol. 2\u00a0led all\u00a0cassette\u00a0albums in sales in 2017, with 19,000 copies sold (see list, below).\u00a0The Nos. 2 and 3 sellers\u00a0\u00a0were the first\u00a0Guardians\u00a0soundtrack, with 15,000 copies, followed by the\u00a0Guardians of the Galaxy: Cosmic Mix, Vol. 1\u00a0album with 5,000. (The\u00a0Cosmic\u00a0set is the soundtrack to the animated TV series.) 22 percent of all\u00a0cassette\u00a0album sales in 2017 were generated by the those three\u00a0Guardians\u00a0albums. Combined, they equaled 39,000 of all\u00a0cassette\u00a0album sales in 2017. The sizable sales for the\u00a0Guardians\u00a0albums on\u00a0cassette makes sense, considering how the\u00a0Awesome Mix\u00a0tapes factor into the films\u2019 storylines. The\u00a0Stranger Things, Volume One\u00a0soundtrack is the year\u2019s fourth biggest seller (3,000), while\u00a0Eminem\u2019s\u00a0The Eminem Show\u00a0is No. 5 with nearly 3,000. Rounding out the top 10 titles on\u00a0cassette: an album that was clearly meant to be on\u00a0cassette:\u00a0The Hamilton Mixtape\u00a0(just under 3,000),\u00a0Prince\u00a0and the Revolution\u2019s\u00a0Purple Rain\u00a0soundtrack (2,000),\u00a0Twenty One Pilots\u2019\u00a0Blurryface\u00a0(2,000),\u00a0Kanye West\u2019s\u00a0Yeezus\u00a0(2,000) and\u00a0Nirvana\u2019s\u00a0Nevermind\u00a0(2,000) Top 10 Selling Cassette Albums of 2017 in the US: Rank: Artist, Title \u2014 Sales 1. Soundtrack, Guardians of the Galaxy, Vol. 2: Awesome Mix Vol. 2 \u2014 19,000 2. Soundtrack, Guardians of the Galaxy: Awesome Mix Vol. 1 \u2014 15,000 3. Soundtrack, Guardians of the Galaxy: Cosmic Mix, Vol. 1 \u2014 5,000 4. Soundtrack, Stranger Things, Volume One \u2014 3,000 5. Eminem, The Eminem Show \u2014 3,000 6. Various Artists, The Hamilton Mixtape \u2014 3,000 7. Prince and The Revolution, Purple Rain (Soundtrack) \u2014 2,000 8. Twenty One Pilots, Blurryface \u2014 2,000 9. Kanye West, Yeezus \u2014 2,000 10. Nirvana, Nevermind \u2014 2,000 Source: Nielsen Music, for the tracking period Dec. 30, 2016, through Dec. 28, 2017. This article originally appeared on Billboard.