user: Who is the company ABB

assistant: ABB Ltd. is a Swedish-Swiss multinational corporation headquartered in Zürich, Switzerland. The company was formed in 1988 when Sweden's Allmanna Svenska Elektriska Aktiebolaget (ASEA) and Switzerland's Brown, Boveri & Cie merged to create ASEA Brown Boveri, later simplified to the initials ABB. 

Both companies were established in the late 1800s and were major electrical equipment manufacturers, a business that ABB remains active in today. The company has also since expanded to robotics and automation technology.

user: What would you consider when preparing a Dj set?

assistant: There are many aspects to consider.  Initially having an understanding of the audience and setting, can help in thinking about energy levels (BPMs), and duration.

It is also helpful to plan the direction of the DJ set, ramping from slow BPMs to high ones, perhaps peaking mid-set or just a different series of peaks along the way.

Track selection is key. Having a pre-defined list of potential tracks to play is a great idea.

Another consideration is mixing in key or following a harmonic mixing style for a neat flow.

All of the above require preparation and programming for a well-crafted DJ mix.

user: Is butter required to make cookies?

assistant: Butter is not required to make cookies. Vegetable oils can be a good alternative, especially for people who want to reduce the amount of saturated fat in their diet. There are also an increasing number of plant based butter-like alternatives.