Next to Christmas carols, Sousa marches, and the collected works of Bobby "Boris" Pickett, there's no more seasonal music than bluegrass, which comes to life at the 30 or so major outdoor festivals and scores of smaller events that take place every summer throughout the US. As I write this, on the day after Thanksgiving, 2019's bluegrass season is only a memory, and the 2020 season is more than a half a year away.
Think of the greatest commercial LPs made during the past 72 years: the Solti-Culshaw recording of Wagner's Der Ring des Nibelungen, Magda Tagliaferro's D'ombre et de lumiere, Ornette Coleman's The Shape of Jazz to Come, John Lennon's John Lennon/Plastic Ono Band, and a thousand or so others.