Lets say I have a dictionary that looks like the following:

```
dict1 = {band1Review: ["good rhythm", "cool performance"], band2Review: ["fast tempo", "too loud"]}
band1Review = ["Not good", "terrible"]
band3Review = ["best band ever"]

```

If I know that I have these 2 new reviews, is there a way I can manipulate my pre-existing dictionary to look like the following?

```
dict1 = {band1Review: ["good rhythm", "cool performance", "Not good", "terrible"], band2Review: ["fast tempo", "too loud"], band3Review: ["best band ever"]}

```

I also want to do this efficiently, without tedious loops that may slow my program. Any suggestions?