BTS became the top-selling artist in total CD album sales in the United States in the first half of this year, according to Billboard on Tuesday (US time).

The K-pop juggernaut sold 573,000 copies of its CD albums from Jan. 1 to July 1, the most by a single music act in the US, Billboard said, citing MRC Data, a music sales data provider.

American singer-songwriter Taylor Swift came in next with sales of 414,000 units.

In terms of broader physical album sales that took vinyl albums and cassette tapes into account, however, the American diva came first with 746,000 copies, followed by the Korean male band with 573,000 copies. All the physical album sales by BTS were in the CD format.

The seven-piece boy band was also a runner-up in overall album sales, which combine physical album sales and digital ones. Swift was the top music seller in the category.

BTS achieved the feat despite the fact that it had no new CD album released in the first half of this year. The group last released a CD album, "BE," in November last year.

The band's latest mega hit, "Butter," was dropped in May in the format of a digital single before it went on sale in the CD format earlier in this month.

According to MRC Data, two BTS songs, "Butter" and "Dynamite," ranked first and second, respectively, on the company's list of the 10 top-selling digital songs in the US at the midyear point of 2021.

The group also had two of its albums on the midyear list of the top 10 physical albums in the US -- "BE" at No. 6 and "Map of the Soul: 7," released in February 2020, at No. 10.

Meanwhile, another K-pop act, NCT, ranked No. 8 on the list with its album "Resonance Pt. 1," released in October. (Yonhap)