MP3 files are rather large at 160 kbps and contain ID3 tags.
Those can be played on any device, but the other formats have the same audio quality at about half the filesize.
M4A is an MP4-container format, using the "AAC" (HE) codec at 80 kbps and contains MP4 tags.
OPUS files are OGG containers using the open source "OPUS" codec at 80 kbps and contain vorbis tags. Some older devices might not support them.
| # 1 | 2020-03-23, 65 min | MP3 (75.1 MB) | M4A (38.9 MB) | OPUS (39.8 MB) |
| # 2 | 2020-03-29, 86 min | MP3 (99.2 MB) | M4A (51.3 MB) | OPUS (52.5 MB) |
| # 3 | 2020-04-09, 69 min | MP3 (79.2 MB) | M4A (41 MB) | OPUS (41.9 MB) |
| # 4 | 2020-04-15, 70 min | MP3 (80.3 MB) | M4A (41.5 MB) | OPUS (42.5 MB) |
| # 5 | 2020-04-28, 71 min | MP3 (81.9 MB) | M4A (42.3 MB) | OPUS (43.3 MB) |
| # 6 | 2020-05-09, 69 min | MP3 (79.9 MB) | M4A (41.4 MB) | OPUS (42.3 MB) |
| # 7 | 2020-05-26, 63 min | MP3 (72.2 MB) | M4A (37.3 MB) | OPUS (38.2 MB) |
| # 8 | 2020-06-02, 65 min | MP3 (75.5 MB) | M4A (39.1 MB) | OPUS (40 MB) |
| # 9 | 2020-06-18, 79 min | MP3 (90.8 MB) | M4A (46.9 MB) | OPUS (48 MB) |
| # 10 | 2020-07-06, 68 min | MP3 (78.8 MB) | M4A (40.8 MB) | OPUS (41.8 MB) |
| # 11 | 2020-07-20, 75 min | MP3 (86.3 MB) | M4A (44.7 MB) | OPUS (45.8 MB) |
| # 12 | 2020-08-09, 72 min | MP3 (83.4 MB) | M4A (43.1 MB) | OPUS (44.2 MB) |
| # 13 | 2020-08-28, 75 min | MP3 (86.5 MB) | M4A (44.8 MB) | OPUS (45.8 MB) |
| # 14 | 2020-09-14, 70 min | MP3 (81.2 MB) | M4A (42 MB) | OPUS (43 MB) |
| # 15 | 2020-10-08, 72 min | MP3 (82.8 MB) | M4A (42.9 MB) | OPUS (43.9 MB) |
| # 16 | 2020-10-27, 73 min | MP3 (84.3 MB) | M4A (43.7 MB) | OPUS (44.7 MB) |
| # 17 | 2020-11-16, 73 min | MP3 (84.3 MB) | M4A (43.6 MB) | OPUS (44.6 MB) |
| # 18 | 2020-12-04, 73 min | MP3 (83.7 MB) | M4A (43.3 MB) | OPUS (44.4 MB) |
| # 19 | 2020-12-22, 69 min | MP3 (79.2 MB) | M4A (41 MB) | OPUS (42 MB) |
| # 20 | 2021-01-24, 79 min | MP3 (90.8 MB) | M4A (47 MB) | OPUS (48.1 MB) |
| # 21 | 2021-02-14, 76 min | MP3 (87.8 MB) | M4A (45.5 MB) | OPUS (46.5 MB) |
| # 22 | 2021-03-08, 67 min | MP3 (77.2 MB) | M4A (40 MB) | OPUS (40.9 MB) |
| # 23 | 2021-03-28, 78 min | MP3 (89.8 MB) | M4A (46.5 MB) | OPUS (47.6 MB) |
| # 24 | 2021-04-12, 74 min | MP3 (85 MB) | M4A (44 MB) | OPUS (45.1 MB) |
| # 25 | 2021-05-03, 81 min | MP3 (93.6 MB) | M4A (48.4 MB) | OPUS (49.6 MB) |
| # 26 | 2021-05-24, 76 min | MP3 (87.6 MB) | M4A (44.2 MB) | OPUS (44.2 MB) |
| # 27 | 2021-06-14, 76 min | MP3 (87.7 MB) | M4A (44.3 MB) | OPUS (44.3 MB) |
| # 28 | 2021-07-13, 70 min | MP3 (80.8 MB) | M4A (40.8 MB) | OPUS (42.8 MB) |
| # 29 | 2021-07-26, 71 min | MP3 (81.9 MB) | M4A (41.4 MB) | OPUS (43.4 MB) |