| 2025-10-29 | Sound of a good car engine |
| 2025-09-06 | Nothing needs to be said to do it |
| 2024-09-28 | Keep one's mouth shut, but not stay silent |
| 2024-05-09 | Fire on all cylinders |
| 2023-05-22 | Run smoothly, as an engine |
| 2023-01-20 | What many air conditioners do |
| 2022-05-09 | Make music on a kazoo, say |
| 2022-01-16 | Keep one's mouth shut? |
| 2020-05-23 | Generator's output |
| 2020-04-12 | Sound from a fan |
| 2020-01-03 | Bees make it |
| 2019-07-13 | Background noise |
| 2019-07-10 | Operate smoothly |
| 2019-04-06 | Well-tuned engine output |
| 2018-05-14 | Vocalize on a kazoo |
| 2017-12-11 | Good engine sound |
| 2017-05-18 | Run smoothly |
| 2017-03-21 | Good noise from an engine |
| 2016-09-22 | Run smoothly |
| 2015-07-28 | Fan noise |
| 2015-06-28 | Be busy |
| 2013-12-30 | Beehive sound |
| 2013-07-28 | Run smoothly |
| 2012-04-08 | Run nicely |
| 2011-06-16 | Accompany musically, maybe |
| 2010-10-20 | What fans do |
| 2009-12-07 | What you can do if you don't know the words |
| 2008-09-13 | Symptom for a car mechanic |
| 2007-10-03 | Make music on a comb |
| 2007-04-24 | Play a kazoo |
| 2006-11-22 | Run smoothly |
| 2005-10-21 | Run smoothly |
| 2003-12-11 | Be busy |
| 2003-11-13 | Use kazoos |
| 2003-09-02 | Run smoothly |
| 2003-04-20 | Be busy |
| 2000-12-10 | Proceed without the words |
| 1999-12-16 | Be busy |
| 1998-03-19 | Be busy, as a bee |
| 1997-03-02 | Continuous sound |
| 1996-11-10 | Continue without the words |
| 1996-05-05 | Be busily active |
| 1994-02-10 | Proceed smoothly |